What year is the wagon?
If the trans is from a 300SD, it uses an electronic speedo. The only w123 that has this setup is a 1981 300TD. They also did not have tachs, so you may be in luck. Pull the cluster and take a look on the backside.
Pics?
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1983 300D Midnight Blue
4 speed, W115 intake mani, non-EGR exhaust mani, KKK K26, 3 pc Euro bumpers, Lo-spec Euro headlights, AL129X, hubcaps, custom A/C
1987 300TD Smoke Silver
Euro headlights, thermostat relocation, coolant bypass mod, rebuilt Becker + Jehnert + Helix audio, OEM Oris roof boxes and surfboard racks, Euro towbar
1983 300TD Reed (Moss) Green / Dark Olive MB Tex Euro spec
1983 300TD Silver Blue / Blue cloth Euro spec, OM648 and 722.6, 15" hubcaps, W126 S2 brakes
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