I had to install a new tach for my BF150 and I want to run the built-in digital hour meter up so that it matches actual engine hours, but it looks like the hour meter doesn't run with just the key turned on. All the hour meters I've ever had on boats will run with they key turned on. The digital display turns on but the time doesn't advance. This is a twin motor installation and the other motor with the original tach does the same thing. Does anyone know how to get the hour meter to advance without actually running the motor? These are OEM Honda/Faria gauges.