Autometer Ultra-lite Gauges - ELECTRONIC AND MECHANICAL GAUGES For 4-, 6- or 8-cylinder engines with 12-volt systems Easy-to-read 2-1/16" diameter gauges Lightweight with durable plastic cases Official instruments of IROC! Electronic gauges use advanced air-core meter movements for top accuracy and response. Mechanical gauges feature quality engineered bourdon tube design and super-durable engineered plastic movements for rugged, reliable performance. Bright fluorescent pointers for at-a-glance viewing. Electronic gauges are easier to install with just wires. Mechanical gauges offer the same accuracy as electronic gauges and install with capillary tubing. Instructions, hardware, all needed senders and 12-volt lighting included. Applications: All Makes All Models 100 PSI