Yeah, the spikes are really annoying. They seem to go away after the engine heats up though... kind of weird. I looked at the raw crank angle waveform with my scope and every now and then it will catch a nasty spike in the negative direction, possibly a result of interference from the ignition wires. Eventually I want to cut the stock ECU off from the crank angle sensor, it's just another device attached to it and who knows what the ECU does to that output. Idealy I would like to run some coax to the sensor, maybe 1 special piece or 2 seperate pieces... The sheild would go to ground and the center conductor would go to the output, maybe run another line with a sheilded power wire. Right now I have the blue wire on the ECU tapped. The control voltage for the sensor is 9 volts...? Either I would have to get a 9 volt regulator or maybe it will still work with 12 or 5 volts?