I have an oil pressure guage but its not connected, it looks like i have the original sender on the block, so what do i need to wire up the guage? kind regards,

If the back of the gauge has 3 wires, one is live, one is ground and the other goes to the sender - and that's it.......if sender is operational it should give a reading...

but make sure your sender is a sender, and not just a switch for a oil pressure light

thats what im thinking it is, ill get the old v.meter out later and have a look. cheers all.

Pressure switches tend to be quite small, oil gauge pressure senders tend to be about an inch and a half in diameter and an inch deep