I just reinstalled a ported 90+ exhaust manifold and a rebuilt garret turbocharger on my 1983 242 with 157K miles. Additionally I had a leak fixed on the radiator. I got the car back together and now the oil temp gauge reads 2.5 bars at full throttle where in previously read between 4 and 5 on a 5 bar gauge. At idle the oil gauge reads close to the read and the oil light will come on. Prior to doing this work I had no low oil pressure issues.

I am not sure if I actually damaged something that would mimic a low oil pressure symptoms or if I have a actual problems.

Any help would be appreciated.
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1983 242 GLT / 1991 244 / 1993 245 / 1999 v70

I am a bit confused by the temp gauge reading is bars as that is a measure of pressure (2.5 bar is about 45 psi). So you are either talking about the tick marks on the oil temp gauge or you are talking about the pressure in bar.

Lets assume it is pressure (as your title says and not the text) you are worried about. If so, it is LIKELY that the wiring to the pressure sender near the oil filter is damaged or the sender itself is faulty/damaged. The only way to know for sure is thread a mecahnical pressure gauge into the hole the sender is in.

I went back and double checked all connector and found the problem. The wiring harness is brittle and a wire was grounded. It is fixed now and I am getting good readings.

Thanks

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1983 242 GLT / 1991 244 / 1993 245 / 1999 v70