Does anyone know what the pin outs are for a Klima relay for an 87 300SDL? The markings on the pin face go...

GK- GK+ 87 15 TD 31
T KL 87K VL GM+

The manual says there are connection for...

+12V
engine rpm
AC compressor power
compressor speed input 1
compressor speed input 2
ACC push button unit input
coolant temp input
ground
WOT switch input
kick down switch input (86 SDL only)

I'd like to run some diagnostics because my compressor works fine when I start the car but at some seemingly random point it cuts out and won't come back on until the engine's been off for a few hours. Low and high side pressures check out when it's running. I can tear open the harness sheathing but it'll be more elegant to tap into the pins.

Thanks,
Sixto
91 300SE
87 300SDL
83 300SD