There are two other threads going on, on this forum, right now regarding the dash HVAC fan resistors. Check those out, as there are a couple of pictures posted. I can't say for sure, but on a lot of coaches the resistor is mounted on the top, front wall of the dash HVAC air plenum that is accessible from the front cap opening for the generator. Facing the front of the coach, the plenum will be pretty high up, on the passenger side, maybe a foot tall and a foot and half wide, and protrudes most of a foot forward from the firewall. On ours, the resistor pack is mounted near the top of that "box", on the top of the front of it. All you will see will be a thin black plate, maybe 1 ½" x 3" with a cable plug attached to the middle of it. Pull the plug and remove the two screws, and you should have it. If it's not there, someone else will have to chime in with better information.
As for the air tank sending unit, I've not encountered that, yet. Sorry about that.
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Jim & Angie, Boise, ID
2021 Entegra Esteem 27U
2017 GMC Acadia Denali
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