Oil pressure instrument

[Henrymk2]

Hello,
I am driving a Jaguar 240 and my oil pressure gauge does not work.
First it showed 40 psi when the engine is running at 3000 rounds/min. When I put on the headlight, it went down to 30 psi.
Now it runs to the end over 60, when I turn on ignition, without engine runnig. It goes back when I turn off ignition. The oil pressure sensor is disconnected.
When I measure the electric, I find11,6 Volt on the point, wehre the cable of the sensor is fastened. On the other point, I find 12,0 Volt.
What can I do?
Regards, Henry from Cologne
Hope you understand my english.

[piman]

Hello Henry,

it will not work unless the sensor is connected. That said they are known to be inaccurate at best. One option is to fit a mechanical pressure gauge however I doubt you will get one that matches the rest of the instruments?

Alec