I'll try to hookup gauge tomorrow and read low side at 2000rpm. Low side at idle 600-700rpm is around 70psi and goes up to 120psi when the compressor cuts out. Sorry I don't have a gauge to read high side. Lines are split and there is no valve between front and back, I think the front and back runs all the time when the compressor is on. Cannot find any fittings in back. Have not charged this truck since I bought it in Nov 04' with 80k. Now it has 111k miles. Thanks in advance...
Jay