hey ya'll. i juss bought a tach because the one in my car is all jackered up. andyway. it's an autogauge (not autometer, but close). i need to know how to wire it. 4 wires; Red is key on power, black is common chassis ground, white is dash lights power, and green is tachometer signal. i'm unsure of how to actually wire these though. obviously... the power/ground speak for themselves. i would assume the white "dash lights power" is wired into the headlight switch. as for the tach signal wire... i'm stumped. i heard it's spliced into a blue wire from the dizzy. any suggestions/insight?