I posted this question futher up and then realized its own thread may be better. I've got it all together but have no RPM signal. Where does the 06' GTO gather its RPM signal. System consists of L33 long block GTO tbody, intake, harness & PCM (haven't verified the PCM yet) Everything seems to work and the tuner says he can see everything but RPM's. Do I need to run the LS2 front cover, sensor & cam gear. Or does the L33 sensor send the same signals, is RPM even generated via cam?