Aftermarket Tach... Please Help! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

HotRod73 · 03-15-2006, 12:11 PM

I have a aftermarket tach i just bought for my 73... has points ignition... how do i hook it up..!!??

i know there are four wires... red is 12v.. where would that go... then black is ground...white is light, where does that go??? and the green is tach signal from engine... im not that mechanicaly inclined sorry can someone help??

86 GMG · 03-15-2006, 04:02 PM

the white can go under the dash to the headlight switch, green goes to the coil (i think) and the red will go to a power source that is hot after ignition switch is turned on a test light will be helpful. best of luck and if i am wrong someone outthere please assist in the answer to this b/c im not to familiar to points ignitions. oh and dont leave your ignition switch on for very long or you will be changing points as well.

swb85 · 03-15-2006, 04:07 PM

Above post is correct--
red: switched 12v source (hot with key on)
white: headlight switch (12v for backlight)
black: ground
green: coil

HotRod73 · 03-16-2006, 10:11 AM

and since i have points i connect to the negative side of coil... correct?

86 GMG · 03-16-2006, 12:37 PM

yes to the negative is correct sorry i didnt say that yesterday

03-15-2006, 12:11 PM	#1
HotRod73 Registered User Join Date: Mar 2006 Location: Norman, Oklahoma Posts: 553	Aftermarket Tach... Please Help! I have a aftermarket tach i just bought for my 73... has points ignition... how do i hook it up..!!?? i know there are four wires... red is 12v.. where would that go... then black is ground...white is light, where does that go??? and the green is tach signal from engine... im not that mechanicaly inclined sorry can someone help??

03-15-2006, 04:02 PM	#2
86 GMG Registered User Join Date: Apr 2005 Location: Tulsa Oklahoma Posts: 943	Re: Aftermarket Tach... Please Help! the white can go under the dash to the headlight switch, green goes to the coil (i think) and the red will go to a power source that is hot after ignition switch is turned on a test light will be helpful. best of luck and if i am wrong someone outthere please assist in the answer to this b/c im not to familiar to points ignitions. oh and dont leave your ignition switch on for very long or you will be changing points as well. __________________ square body trucks an addiction or an investment either way they consume all my extra time and money

03-15-2006, 04:07 PM	#3
swb85 On a budget like Fred Sanford Join Date: Oct 2005 Location: Topeka, KS Posts: 2,031	Re: Aftermarket Tach... Please Help! Above post is correct-- red: switched 12v source (hot with key on) white: headlight switch (12v for backlight) black: ground green: coil __________________ '85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD

03-16-2006, 10:11 AM	#4
HotRod73 Registered User Join Date: Mar 2006 Location: Norman, Oklahoma Posts: 553	Re: Aftermarket Tach... Please Help! and since i have points i connect to the negative side of coil... correct?

03-16-2006, 12:37 PM	#5
86 GMG Registered User Join Date: Apr 2005 Location: Tulsa Oklahoma Posts: 943	Re: Aftermarket Tach... Please Help! yes to the negative is correct sorry i didnt say that yesterday __________________ square body trucks an addiction or an investment either way they consume all my extra time and money



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