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OK, so as I continue to work on my car, I've done a fair bit to the engine to get idle squared away including changing vacuum hoses, manifold gaskets and reference sensors. All seems to be working well now, less the cold start which is still rough for the first couple of minutes to the point where I have to throttle up to keep it from stalling out. It's an ROW vehicle that has a US '86 3.2 with cat and O2 sensor, but there is no connector from teh engine bay to the DME to connect it. After checking the DME to see what version it was (Bosch: 0 261 200 050 / 911.618.111.05), which after some research here, it seems to point to a US / Japan DME as well. That said, what is the effect if the DME "thinks" there's an O2 sensor, but in fact it has no connection to get a signal back to adjust. Couple of questions:

(1) Is this a major issue?
(2) Should I try to run a wire from the O2 sensor (2 wire) to the DME connection point?
(3) Does it really make a difference to cold start?

Thanks