I sent an email to Garnet the maker of the SeeLevel system and they said the following.
Thank you for contacting us about your SeeLeveL RV system.
You will need to have a momentary switch in place of the 3-way switch that is currently in there. You’ll have to cut the wires to the pump switch and pop it out and then put the momentary switch in it’s place. If you can’t find a momentary switch locally, we can provide one for you. We will just need you to pay the freight for the switch coming to you.
I am going to do what they recommend and I think my original momentary switch will work.