I bought an used 04 RXP with a RIVA stage 2 kit and I must say I love it, blows my old GTX outta the water!

The first time I took it out at the beginning of the season, I noticed that the VTS gauge moves around as I ride. Also, if I put the VTS all the way down, the gauge jumps to the top and I need to hit the up button to bring it back down. I checked the back of the ski and even though the gauge goes back to the top, the pump stays down. Does anyone know why this would happen? I know the VTS is a horrible design and have already bought the vtstrimfix and sensor fix, but I was curious about other peopleís opinions.