I have an 04 base with 129xxx miles I noticed today that at idle my oil pressure pulsates form about 15 to 25 constantly, I dont have a rough idle, i haven’t been able to drive much last couple of months due to the worlds situation but I believe it wasn’t happening before, I been using 10w30 , only mods are a motordyne iOS thermal plenum spacer, berk test pipes and hks exhaust ( which I just put on a couple days ago) thank you for any help

 

Have you checked the wiring for the gauge cluster?
It could be the gauge or the oil pressure sending unit.