Black tank sensors removal

I am trying to remove the tank probe well nuts in my black tank to replace the probes with Horst Miracle Probes. I can loosen the old probe but cannot remove it. I didn't want to cause damage so I stopped and am trying to find someone who can help. I was hoping to use the See Level system but apparently in my 2017 Big Horn 3270, the black tank is not compatible with that system. The tank is an Alpha Sys LLC. I also have a serial number that is on the tank if it would help. Thanks

I've never tackled this before but perhaps you can leave the old (electrically disconnected) sensors in place and drill holes for the new sensors.

The OEM sensors are spin welded into the plastic tank. Not so easy to get out without ruining the tank. Replacing them with new spin weld sensors may be even harder without the right tools, the tank out of the trailer and experience. This video shows how spin welding fittings is done.

https://www.bing.com/videos/search?...D8A340ABA32BE832A445D8A340ABA32BE83&FORM=VIRE