asfik, all 123's use the same cluster base, but the instruments are different. you MUST keep the speedometer/odo gauge, and the tach needs to either stay, or come from another gasser.
the oil/temp/fuel cluster is the same on all, and can be swapped pretty simply.
however, your cluster screws will likely shatter the case when you take it apart, if they are not already shattered, so be prepared, and have some plastic epoxy to reassemble.
yes, I have plenty of 123 clusters and gauge sets available.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!