When your vehicle leaves the pavement, the importance of differential temp cant be understated. Make sure your vehicle will make it safely back to the pavement and ensure the long life of your differential with AutoMeters Short Sweep Electronic Diff Temp Gauge. Built with the same attention to quality and detail as every AutoMeter gauge, you can be assured of top notch accuracy and durability thanks to AutoMeters patented air core meter movement.. A single wire 18 NPT temperature sender is included.