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hmmm... to be absolutely sure I have to check under the hood. But for right now, from the top of my head ... here's what you look for. Locate the ignition coil packs. Its where your spark plug wires connect to (not the spark plug end - the other end). To be absolutely sure there are three of them and each coil fires two cylinders (plugs). Now look carefully where these coils are sitting (its the same plate they are connected to) - that's your ECM module. Now on the left side of the engine (if you're facing the car its your right side - driver side) you shoud see 2 wire harnesses/plugs that are connected to the ECM module. Find the one with 5 (five) wires in it. The middle wire and I believe its white in color, is the tach wire. Just get a tap from that wire and you're good to go. Of course the rest (buying a Tach o meter and finding positive wire and ground) I'm expecting you to able to by yourself!!!

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Q: How do you install a RPM gauge on a 1994 grand am?
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