Autometer Phantom 120-240 Mechanical Water Temp Gauge2 1 16 in. diameter, 120 to 240 degrees F, mechanical, Phantom series, water temperature gauge. This Phantom gauge is designed for that Pro Street car, truck and street rod. It's a no nonsense, race quality gauge with a crisp, modern appearance. Uniform soft glow lighting along with the included red and green light bulb covers provide a personalized effect.