LMC tachometer - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gramps77 · 01-04-2013, 02:02 AM

Has anyone done the LMC swap to include the wire harness they sell? Is it simply a matter of swapping this in and then adding the smaller fuel gauge in the cluster to the left? I have dual tanks also and arent sure if that effects anything

**N2TRUX** · 01-04-2013, 12:30 PM

Anyone?

J Knight · 01-04-2013, 01:03 PM

That lmc tach seems to be a replacement tach for a tach cluster. Regular clusters housings are not the same.
Posted via Mobile Device

gramps77 · 01-04-2013, 01:36 PM

I could of sworn I read installing a tach was as easy as finding one and using the smaller fuel gauge.
Im sure SOMEONE can verify, with some pics hopefully.

88Jimmy4x4 · 01-04-2013, 01:35 PM

you would need the back overlay for it to work with gas gauge

gramps77 · 01-04-2013, 01:37 PM

Quote:

Originally Posted by 88Jimmy4x4

you would need the back overlay for it to work with gas gauge

and we're talking about the "circuit board" correct?
Why did they make it so hard with these trucks? My Novas are easy to add this stuff.

88Jimmy4x4 · 01-05-2013, 09:12 AM

Quote:

Originally Posted by gramps77

and we're talking about the "circuit board" correct?
Why did they make it so hard with these trucks? My Novas are easy to add this stuff.

My 76 truck did not come with a tach cluster so I purchased a complete cluster and compared the non tach vs tach extensively with a diagram before I installed it and harness was same but overlay was diff......They changed in 77 or 78 and up to diff harness so it has to be repinned at harness.

search threads about adding tach etc, surely this was discussed before.

68Timber · 01-05-2013, 10:02 AM

I think this one is plug n play, well, after running the tach wire: http://www.gmsportssalvage.com/?q=node/1530

Firebirdjones · 01-05-2013, 06:16 PM

Quote:

Originally Posted by BRUISER

I think this one is plug n play, well, after running the tach wire: http://www.gmsportssalvage.com/?q=node/1530

At least that one reads above 5,000 and makes it usefull.

I could be mistaken but the fonts look as though they would only match later years.

Telecasterjoey · 01-04-2013, 01:42 PM

As far as I could tell when I was rigging up my tach cluster the printed circuits on the back are all the same all you have to do is relocate the metal tabs that the gauges slide into (if you moved the fuel gauge to the bottom left). I had to modify my plastic cluster housing for a tach as the bottom is larger with the combo tach/fuel gauge. It's very easy to do though.....
There is a little plastic piece that goes into the housing that the tach mounts to i unfortunately don't have pics of it.

I wanted my cake and eat it too lol I found a tach fuel gauge combo and a clock!

pontgta · 01-06-2013, 08:25 AM

Quote:

Originally Posted by Telecasterjoey

As far as I could tell when I was rigging up my tach cluster the printed circuits on the back are all the same all you have to do is relocate the metal tabs that the gauges slide into (if you moved the fuel gauge to the bottom left). I had to modify my plastic cluster housing for a tach as the bottom is larger with the combo tach/fuel gauge. It's very easy to do though.....
There is a little plastic piece that goes into the housing that the tach mounts to i unfortunately don't have pics of it.

I wanted my cake and eat it too lol I found a tach fuel gauge combo and a clock!

This is just the best setup i have see....

BLE 'BURBAN · 01-05-2013, 12:24 AM

I "FRANKENSTIENED" mine to include an air pressure gauge in the lower left corner.

69GMC910 · 01-05-2013, 05:41 PM

Is anybody running the above tachometer?
Posted via Mobile Device

J Knight · 01-05-2013, 06:00 PM

Quote:

Originally Posted by 69GMC910

Is anybody running the above tachometer?
Posted via Mobile Device

Yes
http://67-72chevytrucks.com/vboard/s...e+combo&page=3

69GMC910 · 01-05-2013, 08:40 PM

Thanks Firebirdjones! DEFINATLY ordering now!!!
Posted via Mobile Device

moneyeater · 01-06-2013, 07:47 AM

Very interesting! I thought about the LMC tach and moving the fuelgauge to the clock location since it doesn´t work anyway! Only drawback is that the little gauges are hard to read for tall persons because the don´t angle upwards!
Volker

88Jimmy4x4 · 01-06-2013, 09:56 AM

I dont see how the printed circuits are all the same when they sell so many different versions. They make look the same to the untrained eye but if you follow the start and end of the embedded copper trace they go to diff locations.

heres a non tach cluster first and tach cluster last two pics for comparison

Captkaos · 01-09-2013, 02:46 PM

The printed circuit on the tach vs non tach aren't the same, in addition, the actual housing isn't guaranteed the same either.

C10_Dreamin · 02-25-2014, 01:58 AM

I bought the LMC Tachometer and wiring harness and of course it didn't come with a wiring diagram. After thinking of it a couple of days I got my multimeter, 12v power supply, spare distributor, and wired up tach to test my theory that the threaded terminals that would plug into the fuel sending unit are probably not needed and they aren't, the tach moved with power, ground and the signal from the dist.

A solution to some setups w/o oe tachometer?

81 Chevy C10 w/o tach, check out the pictures for install. Only +, Neg-, and (S)ignal are needed for this tach to work, cut the factory threaded terminal screws!

Name: tach1.jpg
Views: 1920
Size: 62.5 KB

Name: tach1.jpg
Views: 1920
Size: 62.5 KB

Name: Rewired.jpg
Views: 3036
Size: 55.9 KB

Name: prongs.jpg
Views: 1874
Size: 38.7 KB

I RESET MY ODOMETER WHILE I WAS AT IT!!!

Name: Frontview.jpg
Views: 1827
Size: 75.6 KB

Fixwhataintbroke · 02-25-2014, 03:31 AM

Quote:

Originally Posted by C10_Dreamin

I bought the LMC Tachometer and wiring harness and of course it didn't come with a wiring diagram. After thinking of it a couple of days I got my multimeter, 12v power supply, spare distributor, and wired up tach to test my theory that the threaded terminals that would plug into the fuel sending unit are probably not needed and they aren't, the tach moved with power, ground and the signal from the dist.

A solution to some setups w/o oe tachometer?

81 Chevy C10 w/o tach, check out the pictures for install. Only +, Neg-, and (S)ignal are needed for this tach to work, cut the factory threaded terminal screws!

Attachment 1219246

Attachment 1219247

Attachment 1219248

I RESET MY ODOMETER WHILE I WAS AT IT!!!

Attachment 1219249

That is just pure brilliance

walkerb · 02-25-2014, 07:42 AM

Quote:

Originally Posted by C10_Dreamin

I bought the LMC Tachometer and wiring harness and of course it didn't come with a wiring diagram. After thinking of it a couple of days I got my multimeter, 12v power supply, spare distributor, and wired up tach to test my theory that the threaded terminals that would plug into the fuel sending unit are probably not needed and they aren't, the tach moved with power, ground and the signal from the dist.

A solution to some setups w/o oe tachometer?

81 Chevy C10 w/o tach, check out the pictures for install. Only +, Neg-, and (S)ignal are needed for this tach to work, cut the factory threaded terminal screws!

Attachment 1219246

Attachment 1219247

Attachment 1219248

I RESET MY ODOMETER WHILE I WAS AT IT!!!

Attachment 1219249

Nice job!

motornut · 02-25-2014, 10:51 AM

Quote:

Originally Posted by C10_Dreamin

I bought the LMC Tachometer and wiring harness and of course it didn't come with a wiring diagram. After thinking of it a couple of days I got my multimeter, 12v power supply, spare distributor, and wired up tach to test my theory that the threaded terminals that would plug into the fuel sending unit are probably not needed and they aren't, the tach moved with power, ground and the signal from the dist.

A solution to some setups w/o oe tachometer?

81 Chevy C10 w/o tach, check out the pictures for install. Only +, Neg-, and (S)ignal are needed for this tach to work, cut the factory threaded terminal screws!

Attachment 1219246

Attachment 1219247

Attachment 1219248

I RESET MY ODOMETER WHILE I WAS AT IT!!!

Attachment 1219249

nice work

motornut · 02-25-2014, 11:04 AM

the board is different too for idiot lights,my 78 the gauge location changes too

Sodell · 02-25-2014, 11:18 AM

Nice work.

C10_Dreamin · 02-28-2014, 08:42 PM

Was able to change all the 194 bulbs to low wattage 194 LEDs. These stay way cooler too! The plastic was turning a burnt color near all the lamp holes!!

Name: image.jpg
Views: 287
Size: 30.8 KB

Name: image.jpg
Views: 287
Size: 30.8 KB

01-04-2013, 02:02 AM	#1
gramps77 Registered User Join Date: Oct 2011 Location: Plumas Lake, CA Posts: 386	LMC tachometer Has anyone done the LMC swap to include the wire harness they sell? Is it simply a matter of swapping this in and then adding the smaller fuel gauge in the cluster to the left? I have dual tanks also and arent sure if that effects anything

01-04-2013, 12:30 PM	#2
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,021	Re: LMC tachometer Anyone? __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

01-04-2013, 01:03 PM	#3
J Knight Registered User Join Date: Jun 2011 Location: Baytown TX Posts: 2,219	Re: LMC tachometer That lmc tach seems to be a replacement tach for a tach cluster. Regular clusters housings are not the same. Posted via Mobile Device __________________ John 82 Chevy Silverado 350ci/TH350

01-04-2013, 01:36 PM	#4
gramps77 Registered User Join Date: Oct 2011 Location: Plumas Lake, CA Posts: 386	Re: LMC tachometer I could of sworn I read installing a tach was as easy as finding one and using the smaller fuel gauge. Im sure SOMEONE can verify, with some pics hopefully.

01-04-2013, 01:35 PM	#5
88Jimmy4x4 Registered User Join Date: Oct 2003 Location: houston, texas Posts: 1,974	Re: LMC tachometer you would need the back overlay for it to work with gas gauge __________________ 2008 Silverado Z71 RCSB 1991 GMC Jimmy 4x4 1976 GMC Sierra C15 SWB

01-05-2013, 10:02 AM	#8
68Timber I know the pieces fit Join Date: Nov 2007 Location: MONTGOMERY, AL Posts: 5,523	Re: LMC tachometer I think this one is plug n play, well, after running the tach wire: http://www.gmsportssalvage.com/?q=node/1530 __________________ John 79 2wd Blazer (Bruiser) 85 M1009 Blazer (Sarge) build 74 Honda Z50 build

01-04-2013, 01:42 PM	#10
Telecasterjoey Registered User Join Date: Nov 2010 Location: Ottawa ON Posts: 514	Re: LMC tachometer As far as I could tell when I was rigging up my tach cluster the printed circuits on the back are all the same all you have to do is relocate the metal tabs that the gauges slide into (if you moved the fuel gauge to the bottom left). I had to modify my plastic cluster housing for a tach as the bottom is larger with the combo tach/fuel gauge. It's very easy to do though..... There is a little plastic piece that goes into the housing that the tach mounts to i unfortunately don't have pics of it. I wanted my cake and eat it too lol I found a tach fuel gauge combo and a clock! Attached Images

01-05-2013, 12:24 AM	#12
BLE 'BURBAN In the Forgotten far North. Join Date: Jul 2007 Location: Anchorage, Alaska Posts: 2,627	Re: LMC tachometer I "FRANKENSTIENED" mine to include an air pressure gauge in the lower left corner. __________________ 1987 R3500 CREW CAB DUALLY (BIG RED)Acquired 06/12/2015 1990 chevy suburban V2500 5.7L My cluster Mods-Nov 2007 overhead console Stereo install Round 2 Aug 2009 Heated/turn signal mirror upgrade

01-05-2013, 05:41 PM	#13
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: LMC tachometer Is anybody running the above tachometer? Posted via Mobile Device __________________ 82 GMC High Sierra VortecPro 496 12 Bolt, 3.42's AFR 265 Holley 850 Performer RPM Air Gap Hooker 2455's TCI Turbo 400 Super Street Fighter TRRC 12 Bolt Eaton Posi/3.42 Mark Williams Axles Cal-Tracs Hoosier 30x10.5 Radial Slick Ryan Brown Performance 850 Holley Full weight long box pickup Current best- 11.28@119mph

01-05-2013, 08:40 PM	#15
69GMC910 MOTORHEAD! Join Date: May 2000 Location: Devon AB, Canada Posts: 849	Re: LMC tachometer Thanks Firebirdjones! DEFINATLY ordering now!!! Posted via Mobile Device __________________ 82 GMC High Sierra VortecPro 496 12 Bolt, 3.42's AFR 265 Holley 850 Performer RPM Air Gap Hooker 2455's TCI Turbo 400 Super Street Fighter TRRC 12 Bolt Eaton Posi/3.42 Mark Williams Axles Cal-Tracs Hoosier 30x10.5 Radial Slick Ryan Brown Performance 850 Holley Full weight long box pickup Current best- 11.28@119mph

01-06-2013, 07:47 AM	#16
moneyeater Registered User Join Date: Feb 2003 Location: Northern Germany,near Bremen Posts: 684	Re: LMC tachometer Very interesting! I thought about the LMC tach and moving the fuelgauge to the clock location since it doesn´t work anyway! Only drawback is that the little gauges are hard to read for tall persons because the don´t angle upwards! Volker __________________ My little US vehicle parts business: http://www.thegearheaddepot.com/ Come have a look! ´81 GMC C 10, Spanish Red

01-06-2013, 09:56 AM	#17
88Jimmy4x4 Registered User Join Date: Oct 2003 Location: houston, texas Posts: 1,974	Re: LMC tachometer I dont see how the printed circuits are all the same when they sell so many different versions. They make look the same to the untrained eye but if you follow the start and end of the embedded copper trace they go to diff locations. heres a non tach cluster first and tach cluster last two pics for comparison Attached Images __________________ 2008 Silverado Z71 RCSB 1991 GMC Jimmy 4x4 1976 GMC Sierra C15 SWB Last edited by 88Jimmy4x4; 01-06-2013 at 10:05 AM.

01-09-2013, 02:46 PM	#18
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Re: LMC tachometer The printed circuit on the tach vs non tach aren't the same, in addition, the actual housing isn't guaranteed the same either. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

02-25-2014, 01:58 AM	#19
C10_Dreamin Registered User Join Date: Mar 2012 Location: Houston, Tx Posts: 85	Re: LMC tachometer I bought the LMC Tachometer and wiring harness and of course it didn't come with a wiring diagram. After thinking of it a couple of days I got my multimeter, 12v power supply, spare distributor, and wired up tach to test my theory that the threaded terminals that would plug into the fuel sending unit are probably not needed and they aren't, the tach moved with power, ground and the signal from the dist. A solution to some setups w/o oe tachometer? 81 Chevy C10 w/o tach, check out the pictures for install. Only +, Neg-, and (S)ignal are needed for this tach to work, cut the factory threaded terminal screws! I RESET MY ODOMETER WHILE I WAS AT IT!!!

02-25-2014, 11:04 AM	#23
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: LMC tachometer the board is different too for idiot lights,my 78 the gauge location changes too Attached Images __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350



Register or Log In To remove these advertisements.

02-25-2014, 11:18 AM	#24
Sodell Registered User Join Date: Mar 2013 Location: Fayetteville Arkansas Posts: 830	Re: LMC tachometer Nice work. __________________ Scott 87 Chevy 2WD SWB, 88 4x4 LWB http://67-72chevytrucks.com/vboard/s...d.php?t=610652

02-28-2014, 08:42 PM	#25
C10_Dreamin Registered User Join Date: Mar 2012 Location: Houston, Tx Posts: 85	Re: LMC tachometer Was able to change all the 194 bulbs to low wattage 194 LEDs. These stay way cooler too! The plastic was turning a burnt color near all the lamp holes!!

Register or Log In To remove these advertisements.