Hi guys. I bought a 1992 Toyota truck from the original owner. I've been chasing this guy for a long time and he finally sold it to me. Well, when I drove it home, the oil pressure dropped significantly at low RPMs after the truck reached operating temp. As soon as I accelerate the pressure goes up to the middle of the gauge. The oil level is fine but the truck does have 220K miles on it.
I didn't find the right solution from the Internet.