Designed to give year after year of dependable service. Factory-calibrated gauge and transmitter are combined in one quality-engineered unit. No need to install and wire separate transmitter. 0-8,000 RPM readings. 100 RPM graduations are evenly spaced over the entire scale for accurate reading at a glance. Withstands strong vibrations; eliminates irritating bounce and flutter to assure accuracy. Mounts on or under dash or console. Simple wiring necessary. Attractive high-impact black grained housing is approx. 3-1/2"D. Black face with white numbers and red shift indicator. Fits all 4-, 6- or 8-cylinder vehicles with 12-volt negative-ground systems. Instructions. Not for diesels.