Rick's is proud to bring you this set of retro-style gauges to add a little nostalgia to your G-machine or Pro Touring Camaro. Marshall Instruments is at the pinnacle of gauge design and their quality shows in their 60's Muscle Series. You can set high and low limits on the gauges and the gauges will flash brightly when either one of these limits are crossed. Each gauge will do a full-sweep calibration when the ignition switch is turned on so you will know they are monitoring your Camaro properly time and time again! NOTE: Oil and Temperature sending unit threads are 1/8".