Thanks for the clarification. Looking closer, I do see pin numbers 7 & 10 in your photo of post #7. The schematic in post #5 suggests the pressure switch & "temperature control unit (push-button or TempReglar box?) are on the logic side (coil) of the AC clutch relay (inside KLIMA). If so, one must be concerned about putting them directly in series with the AC clutch current, which your jumper does (i.e. might damage them).

However, the schematic for my 1984 (no KLIMA box) has the pressure switch in series with the clutch, but the "temperature control" is on the logic side (simple Bosch relay). Thus, the pressure switch can handle the clutch current, but the temp control box might be damaged by the jumper. I always wondered why they didn't put the pressure switch on the logic side. Perhaps thought safer if directly in series, so a failed relay (fused contacts) wouldn't keep the compressor on and over-pressurize, though it appears to be on the logic side in 1985 cars.