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Autometer GT Series 52mm Full Sweep Electronic 8-18 Volts Voltmeter Throttle Bodies Nitrous Express GM LS 112mmKeep Tabs On The Health And Output Of Your Vehicles Electrical System Safely And Accurately With Autometers Ultra Precise Digital Stepper Motor Voltmeter. With Precise Resolution And Ultra Smooth Needle Movement, This Gauge Operates Anywhere From 8 18 Volts On Negative Ground Electrical Systems. A Direct Plug In Wiring Harnesses Included For Ease Of Installation.