Hi, I have a freshly rebuilt Flathead (51 truck motor) complete with offy heads, three twos, and isky 400 jr cam. Started right up first time but mechanical oil pressure guage (good) is still reading 0. Anything to look for? New high volume oil pump. Any good way to prime the pump? Any help is greatly appreciated. Haven't run it sense, and winter puts things on the back burner, but good time to do reaserch. Thanks again!