Matt
The hour meter inside the coach should be simple to change if it is bad. Before changing it you may want to do a little trouble shooting. The hour meter has two connections Switched B+ (pin F on P8 Genset connector plug) and GND (pin A on P8 Genset connector plug). You should see 12v (nominal) on B+ when the generator is running. If you have a control panel that has gauges the B+ is used for their lights and the voltmeter, so if they are working you have voltage to the panel.
There is a small cable (or group of wires) running from your generator into the coach. The end connecting to the generator is a 10-pin plug (P 8 ). I originally only had an hour meter and the start stop switch (5 wires). If I remember correctly the plug was on the passenger side front under some access panels (some disassembly required).
Steve