2007 chevy Tahoe
My pil gauge went from normal to 80 then
down to 0 no knocking in motor what
Maybe something wrong with oil pressure sending unit? You might be able to use analog gage in place of sending unit to check oil pressure? Generic oil pressure spec, 20--30 psi at idle. 40--60 psi at cruising speed. Those specs are just generic, you would do better to look up proper oil pressure specs for your vehicle. I don't have that.