Monitoring your tanks can be as easy as shining a flashlight at the side of your tank to illuminate what is inside. If you want something a step up from that, you can make sure your tank has a couple of threaded fittings near the top and bottom, then install a transparent tube between them to show the level. Something like this:

Both of those low-tech options require going outside, since that is where I put my tanks. I wanted an easy solution that could be checked from inside, at a glance.

RVs usually ship with electrodes built into the tank that make contact with the water at various levels. It is usually not very precise and they tend to fail. Since I am installing my own tank from scratch, I decided to go with something better that didn’t require punching holes in the tank for electrodes.

The SeaLevel 709-HP3W Tank Monitor is marketed as an upgrade for an RV tank level monitor, after the stock monitor fails. It requires no holes in your tank and the level is shown in a precise percentage on the display. However, it only works on certain tank materials and requires a bit of setup. Here is my video showing how I did it:

I forgot to show the LP gas install, partially because it was so easy. I bought this monitor unit to install on my tank, then just wired it up to the display. It literally just clipped into place on the tank.

At the time that I am writing this post, I have had this monitor for over 4 years. It is accurate and I love that it includes the water tanks, battery, and LP gas monitoring in one unit. In colder weather the levels may show incorrect amounts or not detect the senders, but it hasn’t ever lead to a major emergency. My fallback is to put a flashlight up against the tank and visually check the level.