engine has performed flawlessly since rebuild for over a year and is silent running
used 5w-30 or 10w-30 oil, conventional for about 3k miles since rebuild and then synthetic
now oil pressure light came on and initially switched to 10w-40 oil which caused the light only stay on at low idle rpm but goes off when accelerating
will replace the oil pressure sensor tomorrow but someone suggested also to replace a small spring for the oil pump which is located under front left side cover
any other suggestions? am hoping it's just a faulty pressure sensor as I did not replace that during rebuild.