Go to the pitot tubes on the Musketeer. These are the small holes along the exterior of the aircraft that power the gyros through air intake. There are two pitot static tubes on the Musketeer, one on either side of the wing and marked "Static Air, Keep Clean."
Inspect the end of the holes on the pitot tubes and make sure there are no obstructions. If clogged, gently remove using the tip of a sharp tool on the multi-tool.
For a gauge that has a stuck needle or indicator, tap the glass panel to release the needle.
Run the pre-flight check during the run-up. This consists of moving the yoke for the aileron, rudders and elevators; hand-setting any compasses and transceivers, and making sure the gauges are set. If they do not respond after the basic repairs, take the aircraft to a certified mechanic for a legal repair with a certified airplane mechanic.