Allis Chalmer Vintage Tractor Meters are utilized to determine current of vehicle circuit. These are usually attached to automobile batteries to show status of battery charging. Ammeter located inside these instruments is instrumental in indicating positive indication sign when vehicle battery receives current from alternator. When current is being drawn from battery, ammeter shows negative indication. Allis Chalmer Vintage Tractor Meters are simple to install and these are maintenance free. Quality of these instruments has been verified on the basis of their diameter, measurement accuracy, durability and service life. Dial of these products is covered with temper proof glass which is stain and dust proof as well.