Easy Bluetooth Tank Monitor Upgrade

**Steve Morris** · November 11

The following video popped up on my YouTube recommendation list a couple of weeks ago, showing a new Bluetooth enabled replacement panel for the SeeLevel II tank monitors. I thought that this would be a handy upgrade, so I called to place an order, and it arrived yesterday.

Installation was simple. I removed the original 907-P3 panel (Model 907, with Pump switch and 3 tanks) by taking out the four screws holding it to the wall. Then I pulled off the three connectors for the water pump, and removed the Molex connector on the circuit board. The new panel is a 907-BTP7 (Model 907 with BlueTooth, Pump switch, and up to 7 tanks) and came with a new wiring pigtail.

In the video, James shows using WAGO connections. But Oliver leaves very little slack in the wiring for the tank monitor, so there's not much room to cut the existing wires and connect the new ones. And, there's no need to do so. Since we do not have an LP monitor, nor an alarm, we only need the four existing wires; just in different pin locations. The above photo shows the original Molex connector, with, starting from the right: White, Blank, Red, Black, Blue, Blank. As shown in the attached wiring diagram for the new 907-BTP7 panel, all that's needed is to move the last three to the right one pin position, as follows: White, Red, Black, Blue, Blank, Blank. Push on the Molex connector, reconnect the three water pump wires, and replace the panel on the wall. Done, in under 30 minutes! Safety protocol would of course be to switch off the solar disconnect and turn off the batteries before starting, as the Molex pins are not insulated, and bumping them together could cause a spark or blown fuse.

Download the SeeLevel app for IOS or Android, and follow the instructions to get it set up.

Of course, we do not have an LP monitor, nor more than three tanks, so the ALT and LP buttons will not be used. Garnet used to offer a 907-BTP3 panel, but that was several years ago, and is no longer available.

Now, the obvious question, is why would someone want this panel with Bluetooth? Oliver's fresh water tank, like most, has an overflow, so observing tank level isn't really needed for filling. And there are inline flow gauges for much lower cost. But if you're in line at a low flow water fill, with impatient people behind you, it might be nice to know your progress. or maybe you're in the shade, hanging out in your hammock, and suddenly wonder if the shitter's full. Now you can check! 🤣

I'll use it to watch how full the black tank is when I'm flushing it, and monitoring the gray tank when I'm back-flushing it from the drain outlet. It'll be easier than running back and forth between the monitor in the trailer and the faucet on the side of the house. And, simply because I enjoy fiddling with tech stuff like this.

I see that the price has gone up considerably since I ordered on November 7th. It was $109.99, and is now $146.37. That's a 33% increase in four days!
Here's the link if anyone is interested: https://shopusa.garnetinstruments.com/solutions/holding-tanks/c-709-btp7-709-btp7-display

Edited November 11 by Steve Morris