1. Add spacer to solve the problem that the instrument does not return to zero position.
2. Widen the fan-shaped teeth of the separated piece, solve the problem of instrument contact surface and resist abrasion to achieve the function of prolonging the service life.
3. The movement of the instrument is the heart part of the pressure gauge, and more than 80 % of the instrument damage is due to the movement damage, which prevents the instrument from being used by adding a limit pin to the existing movement, thus solving the problem of instrument jumping.
