What would cause this? Its the oil gauge, on the high side. It fluctuates a bit... down to the middle, up a bit higher than in the picture.

 

your oil presser goes up when ur rpm's go up and it will go back down when u are at idle...

 

I had a problem in my Ranger, where when I first started it up it would read 0, and then bounce between 1/2 and 0 before settling down. Had something to do with the sending switch going bad... or something along those lines...

 

nope, its always somewhere between 60-75%, and its never a noticable wavering.

 

What you said is true, but Rangers have "idiot light" type of oil pressure gauges. The sending unit is a N.O. switch, that closes with about 7PSI of oil pressure, making the gauge read about 1/2 scale......it will not show any change in oil pressure.

 

so whats your take on my problem?

 

It's either the sender or the processor/controller of the guage.

If a pump (or engine) were going bad you'd see lower and lower oil pressure. Especially at idle.

Rich

 

OK cool, so you think its more of just a gauge issue. Oil levels are good, synthetic changes every 3k... no idea what else it could be.

 

[QUOTE=Du510]so whats your take on my problem?[/QUOT

The sending unit "switch" would be the first thing to try.