need help on wireing a tach - The 1947 - Present Chevrolet & GMC Truck Message Board Network

special70gmc · 06-19-2003, 08:32 PM

how do you wire up a tach theres 4 wires im gonna give it a shot some one told me that ones power (what kind of power hot?) one goes to the dizzy (where,its an hei) ones ground (i think) and the last is a light (hooked to where )? if anybody replies i thank you as i need to install this tmarrow.

Longhorn Man · 06-19-2003, 08:36 PM

black is a good ground.
Green goes to the neg teminal on an exterrnal coil, or the TACH terminal on an HEI cap. (right beside the power wire)
Red goes to a switched 12V lead. (Hot when ignition is on)
And white goes to dash lights...there should be a spot for that on the fuse box by the lights fuse.

06-19-2003, 08:32 PM	#1
special70gmc Registered User Join Date: Sep 2002 Location: long island, new york Posts: 1,333	need help on wireing a tach how do you wire up a tach theres 4 wires im gonna give it a shot some one told me that ones power (what kind of power hot?) one goes to the dizzy (where,its an hei) ones ground (i think) and the last is a light (hooked to where )? if anybody replies i thank you as i need to install this tmarrow. __________________ 1986 c-10 swb 5/7 drop 20'' coys 1958 belair 2door

06-19-2003, 08:36 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	black is a good ground. Green goes to the neg teminal on an exterrnal coil, or the TACH terminal on an HEI cap. (right beside the power wire) Red goes to a switched 12V lead. (Hot when ignition is on) And white goes to dash lights...there should be a spot for that on the fuse box by the lights fuse.



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