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If you got an external tach gauge at an auto store like i did, it should have four wires to be hooked up: a red, black, white and green one. Your suppose to hook the red up to the proper voltage fuse and then ground the black one on the frame or body of the car but im too lazy so i just ran them straight to the battery; not the most professional way but it hasn't drained my battery yet and it works just fine. the white wire is for the light(if your tach has one); i hooked it of to the foglight switch so it lights up whenever i turn the lights on(even if the foglights are turned of if you hook the wire into the left side). the green wire is the tach gauge wire. the ignition coil should have a "tach test" outlet which is basically for mechanics but i put the wire on it and put the cover back over it to hold it in place and everything worked as it should. ONCE AGAIN, this is not the professional method to do it, i didnt use any proper fuses or splices so if your looking for a pristine setup find another method or get it installed the next time your in a shop, but this works just as well.
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