The instrument/combo switch/dash wiring harness probably has a different pinout. I would think most of those issues would be covered by that. Find the electrical diagrams in the FSM and start your debugging. Chances of fixing climate control == nil unless you transplant that as well.

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

Is the 14 pin connector round?

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'85 300D Cal 280,000 miles
'14 GLK 350 60000 miles

Nope, the 14 pin connector is 7 long by 2 wide. The round connector, not sure of how many pins, is the one that goes on the back of the gauge cluster. It was/is connected, and everything else, including the cluster illumination lights (after a rheostat replacement) work just fine. The clock, speedo, odo, all indicator lights and oil pressure gauge are fine.

-Matt

It sounds like you are suggesting that as a result of the transplant things don't match up? Possible, although the only thing that was changed during the transplant was the motor itself, and all accesories. All vaccuum connections were properly connected back up, and electrical stuff seemed to connect back okay. The only electrical connections made as part of the transplant was starter, ground strap, alternator charging circut, glow plug harness, and the temp sensor, which is a single conductor round plug type, bundled with the glow plug harness. We also added a 110v block heater, but that isn't part of the vehicles electrical system.

-Matt