I have an Edelbrock Qwikdata unit that works great. As long as the motor isn't running I ran the wiring away from all sources of EMI, it's mounted at the top of the car at the back of the cage as far away from the mag as possible. It has worked twice on a pass, but most passes it will not record anything. It is brand new from Edelbrock (replaced the unit that miysteriously quit working) and works fine without the motor running. Anyways, my question is this. I have a pretty good amount of $ tied up in the 0-5 volt sensors, etc and don't want to start from scratch (plus all the wires are nicely run and shrink wrapped) Are either the Racepak or RPM compatible with these sensors?