79-8M0069423 4-1 GAUG 8-32 White.This is a genuine Mercury Marine factory OEM part, not aftermarket.Indicates oil pressure (0-100 PSI), oil temp, voltage (12v) and fuel level. Fits in 4-5/16" (110mm) hole.SC100 link gauges can be connected to a SC1000 System Tach, a MercMonitor or System Monitor.