I changed my oil and all of a sudden I have lower than normal oil pressure it's around 20 till I'm idling then its 0. I had a leak in my spider injector and when I replaced it I changed the oil because it had leaked gas into the oil. I got a new pressure sending unit and I'll see if that help but I'd like to now if there is something else.

 

to be clear - how much gas was in the oil, was it enough to dilute it? and did you wait a bit before starting the motor after refilling? how much oil did you put in and is there any knocking, wavering of the gauge, etc.

 

Just curious, what would "wavering of the gauge" mean?

 

quite literally is the gauge waving about or is it steady on low pressure at idle, a bit of movement is movement is expected but if the gauge is moving erratically then it would point to the pressure sender if there is no knock.