The normal operating temp for thr Brute is somewhere between 180 to 210. Your fan will come on around 210 and pull the temp down to 180 before turning off. The gauge is an Autometer silverlite, part number 4337. You can get it from anywhere that sell's performance parts for cars and truck's. The best part about using this gauge is it's only $40.00 verses $100.00 for the Highlifter brand gauge like most people use and Autometer is the one's that make the gauge for Highlifter!