10-80V Hour Meter - 52mm For 52mm diameter panel hole. 10 - 80 volt dc. Matt black rim and dial with white figures. Non-illuminated. Bridge fitting 75mm deep. Choose a suitable location for the gauge with adequate access to the rear of the gauge for connections and fixings. 2. Switch off ignition and remove key. Disconnect battery (earth terminal first). Note: Before disconnecting battery make sure all system start up codes are known, i.e. coded radios etc. 3. Cut a 51 mm diameter hole at the chosen location for the gauge. Push the gauge into the hole and fit the “U” bracket over mounting studs at the rear of the gauge. Fit washer(s) and nut to each stud. Align gauge and tighten nuts. 4. Connect the terminal marked “+” to a suitable ignition controlled fused supply and connect the terminal marked ”-” to earth or negative feed. 5. Check that all connections are correct and secure. Reconnect battery (earth terminal last). Start engine and check that the hour meter registers