HEI with original Tachometer - The 1947 - Present Chevrolet & GMC Truck Message Board Network

49studebaker · 09-15-2006, 11:17 AM

Can anyone tell me? Will the stock tach in my 71 GMC work with a HEI Distributor? I saw somewhere in a catalog for factory replacement tachs that said "will not work with HEI"? Thanks

**LockDoc** · 09-15-2006, 12:12 PM

I'd be interested to know that too. I just picked up a complete tach instrument cluster with a bunch of parts I bought a week or so ago & would like to put it in my '67/454/HEI rig.

LockDoc

**LockDoc** · 09-15-2006, 01:17 PM

Here is a thread I found on the subject.

http://67-72chevytrucks.com/vboard/s...highlight=tach

LockDoc

*trkklr77* · 09-15-2006, 01:54 PM

should work like any after market tack, tach wire to the neg side of the hei snout. if you lock close it will say batt+ on the right for the hot wire and tach on the left for the signal wire.

powell72 · 09-15-2006, 02:41 PM

I have a factory tach with HEI, no problems or any extra parts needed.

junkyardjohn · 09-15-2006, 03:13 PM

I'VE PUT AT LEAST A DOZEN FACTORY TACHs IN TRUCKS EQUIPTED WITH HEI.s WITHOUT ANY PROBLEM. JOHN

msgross · 09-15-2006, 04:30 PM

no problem with mine, original factory tach and Mallorey HEI distributor. I just put on a female connector and plugged it in....

Longhorn Man · 09-15-2006, 04:42 PM

plug and play.

*trkklr77* · 12-30-2006, 08:49 PM

back for the the dead,

i just got around to mine and had no issues, works fine.

corn · 12-30-2006, 09:10 PM

Its just a way for the gauge companies to sell you a $100 adaptor that amounts to a wire with an HEI wire end. It will work fine, just hook it up...

*wolfthing2000* · 12-30-2006, 10:47 PM

For what it's worth, I just picked up a NOS Sun tach from the late 50s and early 60s that originaly worked with a sending unit, like a magnetic switch that would open close kinda each rev of the engine off of firing intervals from the coil.
I had it rebuilt to work as a modern instrument without the sending unit and to withstand the MSD voltage. The big thing to watch out for is the higher voltage that the tech told me could fry the old school stuff. The older stuff was a lot more forgiving voltage wise than the newer high volt ignitions.

09-15-2006, 11:17 AM	#1
49studebaker Senior Member Join Date: Nov 2005 Location: Victor, Montana Posts: 386	HEI with original Tachometer Can anyone tell me? Will the stock tach in my 71 GMC work with a HEI Distributor? I saw somewhere in a catalog for factory replacement tachs that said "will not work with HEI"? Thanks __________________ 04 4x4 GMC Ext. Cab lifted 71 2wd GMC / Ramjet 350 ready for sheet metal 49 Studebaker pickup

09-15-2006, 12:12 PM	#2
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,653	Re: HEI with original Tachometer I'd be interested to know that too. I just picked up a complete tach instrument cluster with a bunch of parts I bought a week or so ago & would like to put it in my '67/454/HEI rig. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

09-15-2006, 01:17 PM	#3
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,653	Re: HEI with original Tachometer Here is a thread I found on the subject. http://67-72chevytrucks.com/vboard/s...highlight=tach LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

09-15-2006, 01:54 PM	#4
trkklr77 Account Suspended Join Date: Aug 2006 Location: vacaville ca, because it as far from indy as i can be Posts: 777	Re: HEI with original Tachometer should work like any after market tack, tach wire to the neg side of the hei snout. if you lock close it will say batt+ on the right for the hot wire and tach on the left for the signal wire.

09-15-2006, 02:41 PM	#5
powell72 Senior Member Join Date: Jan 2005 Location: Loveland Co. Posts: 3,098	Re: HEI with original Tachometer I have a factory tach with HEI, no problems or any extra parts needed. __________________ Chris 74 Custom Deluxe SWB 350/350/3.73’s 99 2wd Silverado RCSB 5.3/4L60/3.90’s http://www.classictrucks.com/feature...short_bed.html

09-15-2006, 03:13 PM	#6
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,427	Re: HEI with original Tachometer I'VE PUT AT LEAST A DOZEN FACTORY TACHs IN TRUCKS EQUIPTED WITH HEI.s WITHOUT ANY PROBLEM. JOHN __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST

09-15-2006, 04:30 PM	#7
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: HEI with original Tachometer no problem with mine, original factory tach and Mallorey HEI distributor. I just put on a female connector and plugged it in....

09-15-2006, 04:42 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: HEI with original Tachometer plug and play.

12-30-2006, 08:49 PM	#9
trkklr77 Account Suspended Join Date: Aug 2006 Location: vacaville ca, because it as far from indy as i can be Posts: 777	Re: HEI with original Tachometer back for the the dead, i just got around to mine and had no issues, works fine.

12-30-2006, 09:10 PM	#10
corn Registered User Join Date: Dec 2003 Location: here Posts: 5,789	Re: HEI with original Tachometer Its just a way for the gauge companies to sell you a $100 adaptor that amounts to a wire with an HEI wire end. It will work fine, just hook it up...

12-30-2006, 10:47 PM	#11
wolfthing2000 Account Suspended Join Date: Oct 2004 Posts: 1,276	Re: HEI with original Tachometer For what it's worth, I just picked up a NOS Sun tach from the late 50s and early 60s that originaly worked with a sending unit, like a magnetic switch that would open close kinda each rev of the engine off of firing intervals from the coil. I had it rebuilt to work as a modern instrument without the sending unit and to withstand the MSD voltage. The big thing to watch out for is the higher voltage that the tech told me could fry the old school stuff. The older stuff was a lot more forgiving voltage wise than the newer high volt ignitions.



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