Faria Beede Instruments Chesapeake Cyl Head Temperature Gauge With Sender SS 2" White. The resistance of the sending units increase or decrease with the changes in pressure temperature etc. As the sender's resistance varies the amount of current allowed to flow through it to ground changes and the meter deflects showing the temperature. Features of Faria Beede Instruments Chesapeake Cyl Head Temperature Gauge With Sender SS 2" Color: White High quality marine-grade material 2" Temperature Gauge Designed for quick and simple installation Package Contents: Faria Beede Instruments Chesapeake Cyl Head Temperature Gauge With Sender SS 2" Faria Beede Instruments 13806: Chesapeake Cyl Head Temperature Gauge With Sender SS 2" White