To answer the initial question: Most come off by pressure on the back side of the needle. I used a piece of 1/16 thick metal by hacksawing a slit in it and sliding the needle in the slit, behind the guage, and then grasping both ends of the metal and gently applying even pressure on the back of the guage needle while pulling straight out. The needle and stem bend easily so you have to be carreful or its ruined. I also marked where the end of the needle was located on the guage before attempting removal to assure a close return of the needle on the guage to where it was prior to removal. seemed to work ok as the needle settled on the spot it was at when vehicle was previously operated. Ues this procedure at your own risk.