@_Steve posted:I struggled a bit installing on my 1985 because of the sensor thickness. The location that I chose to install turned out to be pretty tight between the tank and pan. I ended up 3D printing a 1/4 inch spacer for the boat hatch. The tank must have an irregular shape because there is no “calibration” (for me) that provides an accurate measurement from empty to full. I have it calibrated to be accurate for the bottom 1/3rd. As such, when the tank is full, Mopika reads about 80%. Perhaps a different installation location would read differently, but it is where it is, not cutting a new hole to move it.
Have you tried backing into the tank height setting? You can do this by putting in a measured amount of water with a hose end meter like this one,
https://www.amazon.com/gp/prod...le?ie=UTF8&psc=1
Then adjust the tank height to suit. I found it was best to do it at, say, 1/3 full (15 gallons), 1/2 full (22.5 gallons), 2/3 full, and full (45 gallons). If you adjust it at each increment you can zero in on a setting that will be very close. I discovered that you can input fractions of an inch like 7.6" even though the display will round it off to full inches.