Rheostat
Fuel (and other liquid level) senders use this variable-resistor system. Some oil pressure senders do, too. A moving contact or ‘wiper’ rubs along a coil of resistance wire, giving a variable output.
Fuel (and other liquid level) senders use this variable-resistor system. Some oil pressure senders do, too. A moving contact or ‘wiper’ rubs along a coil of resistance wire, giving a variable output.