so i hooked up all the wires to get my autometer tach working.. red to power, black to ground.. white for the light and green is supposed to go to the wire coming from the alternator, right? my car has a red wire at the alternator which goes to the battery and a single black wire which "plugs" into the alt. i traced this wire and it turns out it goes to the fuse box inside the car and is just jammed in behind the radio fuse no connector or anything. anyways my tach jumps a little when i turn the key and the lights work fine but it just stay at 0rpm when the car is running. any thoughts?
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