Intermittent oil pressure/lack of oil pressure

Thanks for the advice bohica. I think I was just over reacting. I just took it out to make sure my kickdown was adjusted properly, and when the thermostat hit 195 at idle it went down to about 8 psi. At 2000 rpm, I was getting about 20 psi, and it jumped right up to it. Maybe I'll take a video, the gauges are right next to each other. Next oil change I'll put a heavier oil, but for now I think I should be OK. All I did was put a 4 barrel and intake, but I could have sworn I used to have more oil pressure even at idle.