Mercury SmartCraft SC100 79-8M0052858 4 IN 1 Gauge 12V Oil Temp, Oil Pressure, Voltage and Fuel 4 in 1 gauge, black face, glass lens. Oil pressure (0‰ÛÔ100 psi), oil temperature, voltage (12V), and fuel level functions. Fits 110 mm diameter hole. Application of this gauge will depend on the individual engine model and its available sensors. BEZEL SOLD SEPARATELY. Works with all SmartCraft compatible engines. SC100 System Link gauges allow you to monitor vital engine and boat functions with digital accuracy. Furnished with a fog resistant lens, these gauges can be "daisy chain" interfaced between other SmartCraft products using a plug‰ÛÔin connection. SC100 link gauges can be connected to a SC1000 System Tach, a MercMonitor or System Monitor.