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oh, i know how to do it, i can read pulse width modualtion through a PIC processor and have all the controls i want, but where is the signal to read RPM from the ECU(what pin) or engin(where)? thanks, :)

hi, i want to make a shift light/beep so that i dont have to look at the gauge to know when to shift, question is how do i read RPM? how does the ECU know what RPM it is at? there most be some wire that has RPM on it but i cant seem to figure out which one on a p30 ECU. p30 ecu pinout thanks,