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Answered 2015-07-15 20:47:29
I would suggest you try to find the manufacturer of your tachometer on the web and check out their support site and email them if needed for your particuliar vehicle. For instance below is a link to Autometer's Tech Tip web site however unless you own an Autometer Tach this may be useless to you. There are so many different ignition systems today that it would be difficult to explain each. So its best to get the info from the pro's. , EzForJesus
http://hp.autometer.com/techtips/techtips.html
It's really easy. First you need to find wich wire on the tachometer is the coil signal. Take the black wire and put it on the ground of a 9V batterie then try all the other wires on the positive side of the battery until the RPM move. this is your coil wire. Go on the engine compartiment and find the coil. Start the car. Whit a test lamp try all the wire on the coil until you find the one who flash. Plug the coil wire (on the tachometer) on this wire and the black one on a nice ground. Finally plug the other wire(s) to a 12v source who works only with the key at the RUN position. And it's done
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