Holding tank sensor/gauge system?

Going to rip out everything related to head, tank, plumbing, valves, etc., and install all new stuff, including a sensor and gauge for the new 18 gallon tank on order. (Present tank is 10 gallons, one big poop will fill it up. )
What is the “best” or most reliable sensor/gauge system?
(Started a recent search and found a lot of new stuff, including external sensors, even one connecting via Bluetooth to your smartphone.)

Used WEMA stuff in the past for water and fuel tanks, but have never redone a complete sanitary system before.
Any rock solid recommendations?
(Does external tapes or glued on sensors on a plastic tank come loose or unglued eventually due to heat and vibration?)

(Boat is a 20 year old Albin 28TE, difficult access to reach and remove/replace stuff to say the least, the holding tank installation with sensor and wires need to last 10-15 years with no maintenance. )

Perfect, got an account at Lewis/Jerry’s.

Aha, so they do get stuck and require maintenance?

Once the tank is in, it will be impossible to get the sender out, without removing the tank. (Big job..)

Anybody tried the glue on stuff, like this Swedish product:
https://www.gobiuspro.com/

Raritan also have one:
https://www.raritaneng.com/en/shop/...ntrol-tank-sensor-5-dvc?SearchKeyword=&srch=1

Interesting product, but looks like they only sell a dual gauge for that sensor, I need single only. The sensor can be used with other gauges, but then you have to buy a $150 device to calibrate the sensor to the other gauge.
A bit cumbersome, if they could sell a package, sensor, gauge and cable, I would be all over it.
Thx though.