Feature: Widely used car, truck, yacht, Boat and marine ect. Self-calibration at start-up ensures the meter operates optimally, smart and effortlessly. LED digital screen. Test range: 0-1.00Mpa; When the Oil Pressure is ≤0.08Mpa,Gauge will flash for alarm . Oil Pressure Sensor: 1/8NPT Sensor The red wire is connected to the positive pole of the power supply, and the black wire is connected to the negative pole of the power supply Gauge Install diameter: Φ52mm (2 inch) Note: Installation guide not included, we strongly recommend you seek professional installation. Please check as much as possible to make sure the item is what you need. Material: plastic colour: As shown Package Contents: 1 x oil pressure strap sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.