Hi again everyone. I'm sure this is a unique question and against the purist motto but I have to ask anyway.

As most of you know, the W123 has a cluster with chrome plated needle hubs, etc. The W123 and W126 clusters are not interchangeable due to fit and the mechanical drive on the W123. When I get my hands on a properly working W126 Diesel cluster, I want to swap the needles out for the chrome based W123 type. I think the older style are classier than the bland-looking W126 style. I am also thinking about customizing the efficiency gauge from a gas model cluster by attaching its vacuum line into the tranny modulator line. I think it should simulate the throttle vacuum of a gas engine as that is what MB designed the tranny for.

Are needles interchangeable? Can the left-side cluster pack be swapped and still maintain correct temp, pressure, etc readings to be accurate?

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge