Generator/ Reverse Polarity Question

Hound, nothing personal if you ignore this post as a distraction. When I get involved in a mystery like this I like to thoroughly understand what's happening. In the wiring diagram the connections to the hour meter aren't particularly logical. It has 6 wires going to it: 2 from a generator aux winding, 2 carrying AC power from the inverter, and 2 feeding the 20 amp outlet (but not the 30 amp outlet). A bit of the illogic is removed upon discovering that what the diagram calls an hour meter isn't an hour meter, but a multi function meter. The manual conveniently doesn't say what the functions are, but (to the rescue) the sales material says it displays output voltage, frequency, engine RPM, and run time. Now the connection to the aux winding makes sense because that's where the engine RPM is derived from. Instead of routing the inverter output through the meter module, as shown in the diagram, it appears that they're going straight from the inverter to the outlets (both 20 and 30 amp), and feeding the AC back to the meter module over the 2 small green wires, providing the voltage and frequency information. The run time info and power for the module could come from either the aux winding or AC output. If there's only 1 red and 1 white wire going to the hour meter, that would be the wires from the aux winding. If there's more then one red or one white, it's beyond my ability to guess without more info.