I have a pesky transmission light on and it drives me nuts! There is nothing wrong with the way my car drives or shifts, but the light glares at me. The reason is because of a permanent magnet type speed sensor, which generates an AC voltage of 5VAC and higher to the PCM. As long as the cars computer (PCM) sees this 5VAC, then the light stays off. The sensor itself is buried in the transmission, approx $2,000 in labor. Some guys have designed OP amps to simulate 5 VAC into the computed, and thus fooling it, causing the light to go off (what I want !). I'm thinking that if I can get help designing a small DC to AC transformer, and send 5-10 VAC to the computer, my problem will be solved. Can someone help me out with a transformer, or inverter circuit, whatever is the most compact and simple to build. Whatever it takes to get 5-10 VAC is all I need. Thanks !