Vacuum gauge inop
 

While doing a run up, I noticed the Vacuum gauge was not working it was CAVU, and I wanted to make sure the giros where ok - they are. So what can cause the gauge to stop working?

Also the Rear engine Fuel Pressure ( Fuel Flow) middle in the dual gauge is not working. We replaced the Mechanical fuel pump during the annual and the pump works find any suggestions?



Any help is appreciated

Francisco

More Info
 

Need to know, model, year, ser#, normal asp, etc.
Fred N358

gauge
 

Are the red buttons in or out. Is it just the needle indicator that's not working. working?
Jerry

1964 Cessna 336 S# 336-035 Scuse my speling I ment needle not Middle

Thanks Francisco

Yes Jerry it is the Needle on the rear engine fuel flow that does not work, also the same with bouth vaccum indicators

Thanks Francisco