Originally Posted by
Dustytrix
For the tach on a 92 silverado I connected to the white wire that was on the coil, using the red wire that was on the coil for ignition switched power. But even using the white tach wire that was on the coil you need a 680 ohm resistor. It will read only half rpms that you are running, I don't know how to get that straight but its better than nothing. you are right also with the existing fuel pump relay tie into the green/wht wire. Hope this helps.
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