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Tach


redxlt

Well-Known Member
U.S. Military - Veteran
Joined
Oct 27, 2010
Messages
130
City
Hickory NC
Vehicle Year
1986
Transmission
Automatic
I am installing an aftermarket tach on my 86 xlt 2.9. Instructions state to connect to negative terminal on coil. I have red and a green that plug into coil. I have no wiring diagram and the one in the library doesnt have the same color wires I have. So....
Now the dumb question.... which is the negative wire.? I am assuming its the green? Thanks
 
My truck has only a solid red wire and a solid green wire . Its not like the diagram shows. Thats why I asked the question.
 
Unhook one of the wires and see which one has power when you turn the key on.
 

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