Hi Men. Anybody help me with the output waveform of the speed sensor. Is it just a magnetic reed switch pulling to ground? Pulled up to +12V? Secondly, what is the output waveform of the ECU to drive the stock tacho. Could be a positive (?v) square waveform, perhaps the ecu just grounds the tach wire and its powered from the other side of the tach itself?? Any help would be appreciated. L8r E
Scratch the speed sensor. Miine is totally different. Still like to know what the waveform is that drives the tach tho. L8r E
