Hi Ken,
The under belly is just screwed on, and it can be unbolted and dropped down. On my model the Black and Shower tanks were in front of the axles, and I was able to unbolt the back and drop it down. On the galley sink tank, it was between the axles, so I cut a access door (cut on three sides), and just duck taped close when done. On fresh water I also cut access door.
There is just one pair of wires that go to all gauges in parallel, and I was able to fish the wire via the two doors I cut for galley and fresh tanks.
Since it was a bit colder than recommended when I installed, I stuck a small heater up in the belly to warm things up where I was applying the gauge.
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