I'm not sure what to do. This gauge has done funny things before like randomly showing zero for a day or so and wildly varying pressure at idle. For the most part it would show around 20 psi while at idle. I checked my clearances and I only had one reading on the crank that was almost to the service limit but still within spec and now I'm getting 26-0 psi at idle. It jumps around so erratically im not sure if that is normal or what I should do first. The stock oil light has never come on but it is on when I turn the key and the engine first cranks over. Any suggestions?