the 120mph speedo will also work. Be aware that both speedos use an electrical signal, not a traditional speedo cable
and yes you can drive the SD without a cluster
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1983 300SD (daily driver)
1991 420SEL (work in progress)
1979 300SD (future replacement for 83 SD)
RIP:
1983 300SD (totalled)
1986 420SEL
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