Too low or too high? Give your tractor a gauge that knows the right answer
Does the old gauge on your antique tractor read High or Low all the time? The first step for repair is to locate the defect. This is what you do. If your gauge registers at Too Low all the time, this is almost always caused by a high resistance connection in more than one of your wires. The wire connection to the gas tank gauge is likely a bayonet connection. It often results in high resistance because of exposure to water. To repair a gauge that reads Low, clean up all of the circuit connects, including that of the gauge itself. If this fails to make the gauge read accurately, it will have to be checked with the rheostat to find the defect. Maybe your gauge says Too High at all times? In other words, does your gauge register as nearly full, when you are fairly sure that you might be near empty? Or perhaps the temperature gauge says you are near boiling, when the temperature is likely much lower. These indications are generally caused when the wire that connects the sending unit to the receiving unit is partially grounded. The only way to really know is to use a rheostat in place of the sending unit to determine if the gauge on the dash is in good condition. If after making certain that there is no partial ground on the wire between the two units, the sending unit should be replaced. Tractor enthusiasts find precise and reliable gauges on Steiner Tractor Parts website.