What would be the simplest way to count 12 volt pulses with my '86? I believe the link is not analog so I would think it'd have to be some sort of external hardware setup. BTW, I'm trying to create a TSD rally computer out of the '86. If it can read the pulses from the vehicle speed sensor and take user inputs, it should be capable of doing some nifty real-time displays for rallying. Thanks, Tony