If you mean that oil pressure is at max when the rpms are up, that is good. The gauge should peg at anything above about 1K rpm and can drop as low as .5 bar at hot idle. If you mean the gauge pegs as soon as the key is on, before the engine has started, then yes it sounds like a bad sender.

Not sure what model/year we're talking here, but I would suspect a bad monovalve. When bad they typically produce heat when the car is stopped and blow cool when cruising at speed. Should be able to get a rebuild kit for about $30 or so.

__________________
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.