Volvo 480 Club Europe

My car starts to show STOP alarm for oillevel/temperature after a minute or two. The car is a -88 turbo. Disconecting the sensor gives the exact same behaviour. My question is weather I have a malfunctioning oiltemp/level sensor or a wiring issue?

I'd say dicky wiring, assuming that you have checked that he oil level is OK

ours does it on & off, so don't pay much heed to it , also water temp some days never changes from COLD, although the oil gets to 70 or 80 !

but as long as speedo / rev counter are working happy days

Mine is starting to do the "always cool" water temperature, though I know it's somewhere 80-85°C.

Any way of solving that. I mean before I send my tacho to Brinkie to have the speedo repaired

Either the sensor or the wiring is at fault, the STOP signal is given if the info centre measures too low resistance or if the input is shorted to ground.