Tach

Where can I find instructions on hooking up an aftermarket TACH. I have a 1991 GMC Sierra 4X4. Thanks

All you do is the wire going from the ignition module to the coil there is a wire hanging off of it that has a male connector on it you plug the wire from the tach into that and then wire the other wires into the fuse box in the headlight fuse slot for the light on it.