fuel pump pressure

[maxrizza]

hi everybody from italy
i own a pa28-181 archer III I just put a new engine and everything goes well just I have a problem with the fuel pressure indicator, it doesn't work when the engine is running, it remains at zero but the fuel pressure is ok, I thought was the indicator but not because if I check putting on earth works well so it should be the sonda for the pressure. pls note the aircraft was stopped for 2 years. any suggestions ? thks so much
max

 

[Domenick]

 

[bartmc]

 

[PaulR]

 

[vaflier]

 

[Domenick]

 

[vaflier]