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Assuming the different engine options use the same distributor and cap combination, this is easy. Under the hood, look for the disttributor cap. on the upper left of it is a small black plug with two lead coming out of it. One is brown, and goes to a small capacitor just below the distributor cap. That is the + lead. You need to use the other wire, which is the solid black lead. This is the - lead. It is best to use one of those 2 wire splice terminals, rather than cutting this black lead. Attach the green lead from your tach to this, and you now have the signal that the gauge needs. Dont forget the red power lead, or the tach wont work. Good luck, this worked great for my Protach. (EDIT - I would just connect to the marked wire connection in the diagnostic plug, on the 1990 it's the plug (capped) on the drivers side strut tower. Just make sure you protect the wire from shorting out..)

2009-07-23 21:16:12
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Q: How do you install an Autoguage tachometer on a 1990 Toyota Corolla when you have no instructions and need to know what the green wire connects to?
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