I'll have to look up James Dean. The wiring diagrams I am finding tell me the wire colors but not their functions. It seems they may have used different wires for the different years. I've managed to trace leads and determine what wires go to what sensors but the oil pressure signal seems to be more complicated than just a modulated voltage.

What about the ground Optimusprime? I do have the correct ground in the 15 pin connector. Is there another one?

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Current:
'74 450SLC
'89 190E
'95 E420

Previous:
'94 E320
'87 300E
'73 350SL
'75 450SL
'95 C36
'99 C43 55 swap