Would you like me to e-mail you the pdf for 3.1 M50 1992 external wiring?
Javier
Edit: Tap on them, are you sure? If not taken with a high impedance method, signal may result useless. CPS is a magnetic pickup biased from the ECU 5Vdc, and a low impedance metering circuit may attenuate the output pulses to unacceptable levels.