where did you fit the Social unit? and does it have the four contacts that the normal switch has?
I fitted it down next to the compressor and drilled a hole for the sensor to sit just inside the top of the fridge. From memory my thermostat only had two wires, basically an on off switch so just ran the same wires to the new thermostat.
I'm also going out to the boat next week with a few mods including a variable resistor which can be used to control the speed of the compressor (fast when engine running, slow when sailing) as well as a load of PC fans & controllers to manage the air flow better around the compressor and condensor.
Jonathan