Thanks Grant.
I just talked to Rick @ Motorrad. As Grant says, he knows his stuff, and here's what he told me about ECUs.
The old style ECU is no longer available. There is a new style ECU that is compatible with old and new bikes. However, you should not use the old style ECU with the new style (post '92) coil. Apparently, the new style coil has more resistance and that will stress the old style ECU. You can use the brown dyna coil with either the old or new style ECU. Rick only carries the old style ECU - you can get the new style from your dealer.
So where does that leave me? Let's see - I have an old style ECU that I carried as a spare for my G/S in South America. I can swap that into my PD since I'm also running the dyna coil (compatible with both old and new). I left the stock coil on the bike so I would have some redundancy if I have problems with the dyna coil. However, I cannot drive the old style ECU with the stock coil. Therefore, if I want redundancy with the coil, I need to get a new style ECU which I can use with both the dyna and stock coil.
I hope that's clear to everyone, 'cause I'm not sure I've got it clear yet!
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