●Works on vehicles with conventional, electronic, and distributorless ignition systems ●Can be calibrated to work with 4, 6, and 8 cylinder engines and outboards ●0 to 8000 RPM scale in 100 RPM increments ●Water gauge measures from 130 to 280 degree F with 270 degree sweep ●Oil gauge measures from 0-100 PSI with 270 degree sweep and Voltmeter measures from 8-18 volts with 90 degree sweep