Manual controls. Charge is good. Stays in the "green" zone on the Artic Freeze tester/filler from Autoparts store. Goes to the top of the "charged" zone and cycles off then drops to the bottom of the ''Charged" zone then cycles back on. At idle in 95 degree heat the compressor stayed cycled on & running great.
Without the $90 gauge set, does the above info help?
99 Suburban 144,000 mi. 2500 7.4L 4X4 K&N, Headers, 3" Exhaust