For all auto meter gauges (except clocks, air/fuel, & autogage), speedometers, and most in-dash tachometers. does not work with digital & led lit gauges (i.e. cobalt, c2, es, gs, elite, factory match, nv, phantom ii, sport-comp ii, ultra-lite ii). upgrade your standard instrument lighting with intense leds. replaces 161, 193, 194 & 168 style wedge base bulbs only.