2018 Cascadia…. The sec fair tank air gauge non stop goes back and forth from 100 to 125. Non stop. The primary gauge doesn’t move. I’ve taken it to the shop twice and each time they say they can’t find any leak, meanwhile I sit and watch it go up and down while I drive. Weird part is sometimes it stop and stop at normal levels but then it just goes from 100-125 in about 2min cycles. As soon as the cut out kicks in it starts to drop. Hits 100 goes back up. Over and over and over…
Any ideas?

