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Wiring it up is dead simple....just follow the directions that come with the tach. Four wires is all it takes....the instructions make it ultra easy.
Black wire-ground (any clean metal surface on the truck)
Green wire-tach feed (TACH terminal on HEI)
Red wire-power, any source that is hot with the ignition is on (IGN UNFUSED terminal in fusebox works great)
White wire-Backlighting wire, i tapped into the wire that lights up the heater controls light bulb.
Very, very easy to do. Only took me 20 minutes or so when i installed it on the steering collumn.
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'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride.
'70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck.
'97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg
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