I found a manual online with some information about a/c compressor not switching on. With engine idle and rear defrost on. I discounnect the plugs on the pressure switch (S31/1) and connect those wires together. The compressor still did not kick on. The next step suggested is to test the air-conditioner/automatic temperature control (83-504)

Does anyone have a copy of the manual section (83-504) and (83-505) PDF

Far as the a/c gauge I decide to get another one to check the pressure. Im positive the the connectors were seated on the connections properly. The gauges was most likely bad.