Did the exact same install on my 2004.
Only issue is the waste tank walls on the passenger side are smaller than the walls on the wet bay side, due to the slope and shape of the tanks. This is especially noticeable for the black tank. This results in non-linear readings as the tanks begin to fill. It takes a while for the tanks to hit even 15% full, especially the black, but as they approach 50% or more, they fill rapidly so you cannot "estimate" how soon to dump by how long it took to fill to 50%. You must simply check the gauge more often.
One other quirk I discovered on my grey tank reading. Due to where I placed the sensor strip, relative to the top and bottom of the tank wall, when the tank is actually full of liquid, the sensor reads "0pn", like there is a open circuit in the wires. When that first happened, I thought I had a wiring issue and I rechecked all connections throughout the basement, but they were all good. Draining the tank restored the proper readings and they progressively show the filling of the tanks but, again, in a non-linear way.
Still, it is a great system and easy to use. Like you, I have yet to refill my propane tank and re-calibrate the LP gauge.
Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.