you can use a standard gearbox speed sensor i have just fitted an avcr paul hill @engine advantages set it up for me. i had to go to the scrape yard and get a speed sensor off an xr2i due to me throwing the one that came with my car in the bin years ago.... what an excellent bit of kit boost comes in more progressive as the revs climb alot smoother holding 30psi and i like the display... well worth the money