2 1/16"( 52mm ) Electrical Gauges Set (3 pcs) ( 12 V Negative Ground ) All Gauges are electrical with 2" Dasbhoard fitment , Glass leans, Chrome Bezel, Illumination Dial along with 12 V Lights included with studs & brackets. No Senders included .  Following are the resistance value to work with the senders. Water Temperature Gauge  = 560 - 40 OHMS Oil Pressure Gauge  = 10 - 180 OHMS Oil Temp Gauge  = 740 - 55 OHMS