Re: fluctuating oil press gauge
The fact that the pressure can be controlled by the accelerator bothers me.
If the gauge or sending unit went bad, accelerating would not affect it - or shouldn't. How/why would the gauge even know to change if the pressure didn't?
Could be a number of things - oil diluted with fuel? - change it - smell it - mechanical fuel pump going bad? Injector leaking badly? Fuel pressure regulator leaking fuel into the vacuum line then into the crankcase?
Low oil level? Badly sludged oil?
Could even be a bad ground - the rocking of the engine changes the ground, thus the reading? Turn the lights on and off? Gauge moves? = Body to engine Ground.
CVR? Constant Voltage Regulator - in the dash - keeps the voltages to the instrument panel consistant, so changes in charging system voltage don't affect the instruments. When the CVR goes bad, the gauges go up and down with RPM's. Check to see if you even have one, some don't. It's a cheap item - usually they plug in.
Let us know.