In the wet bay of our coach is a SeeLeveL II tank monitor panel, that shows the battery, fresh tank, grey tank, and black tank levels:

The panel stopped working, and I had it replaced less than a year ago, but it got wet and stopped working again when doing recent wet bay mods, so I needed to replace it again. Rather than paying the inflated price the service place charged me, I ordered the panel from RVupgrades.com, and replaced it myself. I also ordered the correct panel for my coach — notice that the above picture has a button for LPG level too, but my coach doesn’t have any propane.

Here’s the back of the old panel, showing the connectors; power and tank level on the left, and the RVC network port on the right:

The replacement panel, model 709RVC-NLP (RVC for that port, and NLP for no-LP):

I also got a gasket to hopefully protect it from water intrusion a bit:

The new panel installed:

Easy.