My Prosport Oil pressure gauge has decided to go to 7 bar and stay there whenever the engine runs. it still performs a sweep at startup and returns to 0 till you startup.
I am thinking the sender is kerput just wondering if anyone has had this problem before I go buy a new sender.

 

Check the sender wiring, sounds like it might be shorting out.

 

There are two terminals on the sender and I assumed one to the gauge and one to earth, as the wiring diagram is poor!

 

How important is the earth on the sender? got mine earthed on the inlet manifold, wondering if I need to run to the battery? Would'nt care worked fine for 6 months then grief

 

The sender earth is important as it give a circuit for the current. No circuit, no current.

But I reckon yours is either fubarred, or there is a dead short somewhere in the wiring. Can you check along it's length?