The 2" dial 60-0-60 Ammeter is a +/-60 ampere measuring instrument that is used to measure the flow of electric current in a circuit. The left gauge terminal connects to the battery terminal of the alternator, the right gauge terminal connects to the battery terminal on the starter solenoid. This gauge has a stainless steel bezel and a bolt-on gauge clamp that will accommodate panel mounting up to 1/2" thick.