Autometer Z-Series 52mm 140-300 Degrees F Electric Oil Temp GaugeAn Engine Running A High Oil Temperature Will Fail, As Proven Time And Time Again. Monitoring This Critical Parameter Ensures That You Are Running The Correct Weight Oil And That Your Oil Cooling System Is Performing Properly. Highly Accurate And Durable Thanks To Autometers Patented Air Core Meter Movement, A Single Wire, 1 8" Npt Temperature Sender Is Included. Installation Instructions Gauge kit includes 1 8" NPT temperature sender, 3 8" and 1 2"