i have an autometer mechanical boost guage and not hooked up it reads about 2 in vacuum. i hooked it up just to see and full throttle it just goes to 2 in vacuum, isn't it supposed to go to zero at full throttle? so any help is appreciated.

 

So are you saying that when its not hooked up it reads 2 vac, and when you are at WOT it still reads 2 vac?

 

both

 

You have to crack it open and do it by hand. They usually get messed up from being dropped or knocked hard.

 

like skip a couple teeth it?