Tach Info. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

harshard · 12-20-2009, 11:35 AM

I recently ordered and received a tach from LMC truck to put into my 71. On the back of the tach the wire lugs are not marked and there are no instructions with the tach. I have an HEI ignition on my truck that has a prong marked tach. I do not want to cause possible damage to the tach by hooking a hot where a ground should go. Can any one tell me which prong is which. Thanks, Shawn

**too much stuff** · 12-20-2009, 12:16 PM

Not sure about the aftermarket, but the 12V is on the speedo side, coil on the gas gauge side on the originals...

harshard · 12-20-2009, 02:36 PM

Thanks too much stuff, that is what I was looking for and it works right. This site is awsome, you can get so much help on here it is unbeliveable. Thanks again, Shawn

**lolife99** · 12-20-2009, 03:30 PM

Quote:

Originally Posted by harshard

Thanks too much stuff, that is what I was looking for and it works right. This site is awsome, you can get so much help on here it is unbeliveable. Thanks again, Shawn

x2
I learn something everyday!

**too much stuff** · 12-20-2009, 07:04 PM

Glad to help...

12-20-2009, 11:35 AM	#1
harshard Registered User Join Date: Aug 2008 Location: Kaufman,Texas Posts: 102	Tach Info. I recently ordered and received a tach from LMC truck to put into my 71. On the back of the tach the wire lugs are not marked and there are no instructions with the tach. I have an HEI ignition on my truck that has a prong marked tach. I do not want to cause possible damage to the tach by hooking a hot where a ground should go. Can any one tell me which prong is which. Thanks, Shawn

12-20-2009, 12:16 PM	#2
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,713	Re: Tach Info. Not sure about the aftermarket, but the 12V is on the speedo side, coil on the gas gauge side on the originals... __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

12-20-2009, 02:36 PM	#3
harshard Registered User Join Date: Aug 2008 Location: Kaufman,Texas Posts: 102	Re: Tach Info. Thanks too much stuff, that is what I was looking for and it works right. This site is awsome, you can get so much help on here it is unbeliveable. Thanks again, Shawn

12-20-2009, 07:04 PM	#5
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,713	Re: Tach Info. Glad to help... __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto



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