92 dohc gauge clust - 89 sohc. odometer swap?

[89sxRCR]

I went down to my local bad *** nissan wrecking yard yesterday and came away with some goodies for my (very near future) sr swap. One of these goodies was a gauge cluster from a 92 240, so i can hook up the tach. Has anybody done an install on one of these? The 92 tach odometer reads 99 k while my current reads 90. Any way to swap those odometers? Anyway, the back of the gauge cluster just has a bunch of plugs with clipped wires, i assume there will be some re wiring or do i just plug the srs in... as you can see i need some help. Thanks!