if you have a 96 and later omc/brp that had a oem tach then it would have had the big rectangle plug going into it. your new teleflex does not have that same plug connection but its no big deal. only thing you have to do is find the wires that leave the big plug on the wiring harness and then start looking for a black, gray and purple wire. you then take the purple to the 12v+ the black to the 12v- and the gray to the signal pole on the tach the tach may also need to be set to either 6p or 12c. also you will need a sys check guage if it is a 96 and newer model.
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