Oil pressure too high?

I run 15/40 in my Neon, my truck, and a lot of customer engines. It's fine. The relief valve ona small block is up in the pump casting so you have to drop the pan and remove the pump to get to it. A stuck relief would blow the filter. I've over-shimmed a standard volume pump and gotten 120psi on a fresh engine before. But if it stuck you'd really know it. Get a cheapo mechanical gage and stick it on it to see what it's doing. If the system's fine, you can always go back to using the factory gage althought I probably wouldnt unless you had the gage fixed.