I have an 85 yamaha xt350 and i'm having issues with the speedo and tachometer. The speedometer needle seems to get stuck when I ride the bike. The odometer and tripometer work fine but the needle seems like there is something preventing it from moving freely. The tachometer does the same thing. It works but it is like something is preventing it from moving freely as well. When i rev the bike, it takes the needle awhile to read the correct rpm. When i let off the throttle from high rpm, it takes several seconds for the needle to drop back to idle. Is there a way i can take them apart and possibly lubricate the needles? They are in good shape and are expensive to replace so i want to do anything possible to fix them.