Iknow that the '97 ST2 is a 2 phase genny & reg... not sure if the '98 748 is 2 or 3 phase. Easy check... have the regs got the same number of yellow wires - these are the feeds from each phase. If so, it should be ok....
2 phase (2 yellow wires) on my 748, if thats how it works. Only had it a month or so, so this is all still new to me. Thanks for that I will put a bid in on the one on ebay.