A Perfect Solution For Unique Dash Layouts, Autometers Dual Function Water Temp And Voltmeter Gauge Allows For A Flexible Dash Layout And A Clean Look Thats Easy On Dash Real Estate. Combing Individual Air Core Meter Movements Into One Compact Housing, You Get The Same Durability And Accuracy Youve Come To Expect From Autometers Standalone Instrumentation.The Voltmeter Reads Between 8 And 18 Volts On Negative Ground Electrical Systems, And An 1/8" Npt Temperature Sender Is Included.