Factory Tach Hook-Up - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dynaride · 08-12-2013, 11:12 PM

Trying to figure out how to hook up the factory tach and if it will work with my set up. 71 swb w/454 stock HEI dist on engine has a spot for the tach hook up. Only see a red and a black wire coming out of the tach, should there be three and how does it hook up? Research leads me to think red to switched 12 v black to ground and should be a green wire for tach input??? Any help is appreciated!
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08-12-2013, 11:12 PM	#1
Dynaride Registered User Join Date: Aug 2013 Location: Versailles, MO Posts: 2	Factory Tach Hook-Up Trying to figure out how to hook up the factory tach and if it will work with my set up. 71 swb w/454 stock HEI dist on engine has a spot for the tach hook up. Only see a red and a black wire coming out of the tach, should there be three and how does it hook up? Research leads me to think red to switched 12 v black to ground and should be a green wire for tach input??? Any help is appreciated! Posted via Mobile Device



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