sensor

is there a oil sensor switch that regulates the oil pressure to keep the gauge steady 3800 gs

What year Regal GS?

There is an oil pressure sending unit located by the oil filter assembly which is used for the IP idiot light and any analog oil pressure gauge, if equipped. However, the sensor does not regulate oil pressure to the engine. That is done by the oil pump and other internal engine components. Also, the oil filter will affect oil pressure.

What specific problem are you having?

year 1991 i changed the oil and filter already 225000 miles

i was checking to see where the gauge suppose to be when started --its between 40 and 120 1991 regal 3800-also are there any replacement parts to the fuel sending unit or do i have to replace the unit? the gauge is not working

What is the oil pressure reading at idle with engine cold and after proper warmup?

Delco has the level sending unit/float available as a separate part as shown at the link below.

Click here (http://198.208.187.182/internet/PartImage.jsp?mfgname=ACDELCO&prodlinecd=43&acpartnbr=25028349)

its about 60 psi hot or cold---also my fuel gauge stays over full most of the times there only 2 gal of gas in tank since new pump - yesterday it was about 1/2 full i changed the pump about 3 month ago the car been sitting up for 5 years?

As far as the fuel guage, it sounds like you may have pinched a wire when you did the pump swap.

On the oil pressure issue, it is not normal for the oil pressure to remain constant. It should fluctuate, lower at idle and higher as rpm increases.