Marlin's Perch Mount Clock / Thermometer For Harley Marlin's perch mount easily attaches to the brake or clutch side perch clamp with a single screw, enhancing visibility effortlessly. It boasts a dual pivot head design for precise position adjustment that can be securely locked in place, ensuring optimal viewing angles. Features: Machined aluminum housing Water resistant and shock resistant Glow in the dark element Available with clock or thermometer Standard gauge is 1-3/4 diameter Jumbo gauge is 2-1/8 diameter Gauge mount sold separately