These are just raw comments... I do NOT have a definitive answer for you. I have a '95 900ZXI, but the trim system has been removed.
There are two versions... 8-wire & 9-wire. I think (not sure) that my 900 had 9-wires, and the 1100 has 8-wires. I think the extra wire is a yellow color.
It may have something to do with the KATS version (Kawi Automatic Trim System) that does more than the earlier versions with simple up/dn. The Kats would auto trigger full up in reverse mode (but a lot of models don't have reverse buckets anyway), and I think it did some automatic leveling or mid-positioning under certain conditions.
For some vague reason, i thought the newer ones were the 8-wire. Was your original unit really original. The trim systems were troublesome (mostly water intrusion / corrosion) and many have been replaced with used parts and/or removed altogether. My ski has the trim removed and the nozzle fixed at the level position and it runs just fine for most conditions.
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