This will not be a problem. Both the 12 volt and 120 volt limit switches are mounted with easy access directly behind your 'reset' buttons. If you take that small cover off and remove one of the switches you will be able to read the part number. Bring that switch (both switches) to your RV parts department and tell them what degree you would like. easy peasy! Of course be sure to disconnect the power from the RV before fooling with the wiring. Keep your original for spares, and be sure to lightly sand the tank to insure proper contact between the tank and the switch.
I might add these switches are also available online if Google is your friend.
Jim in Memphis
Wife of 49 years is Brenda
2019 F450 6.7 Powerstroke
2017 Mobile Suites 40RSSA
2015 26TBUD Salem Forest River (For Alaska Trip)
2001 Road king w/matching Harley sidecar