Widely used for car, truck, yacht, boat, and marine applications. Self-calibration at start-up ensures optimal, smart, and effortless operation. LED digital screen. Test range: 0-1.00Mpa. Alarm function: gauge flashes when oil pressure is 0.08Mpa. Oil pressure sensor: 1/8NPT. Wiring: red wire connects to positive terminal, black wire connects to negative terminal. Gauge installation diameter: 52mm (2 inch). Material: plastic Color: as shown Package contents: 1 x oil pressure gauge. Only the listed items are included; other products are not included. Note: light reflection and different display settings may cause slight color variations between the image and actual item. Measurement error allowance: +/- 1-3cm. Installation guide not included. Professional installation is recommended. Please verify specifications to ensure compatibility.