This Maybe? Says it's to "modify" to a TH400. Maybe it will fit into a donor indicator housing or fab one.

http://www.ebay.com/itm/1955-1956-C...New-/261347662703?_trksid=p2054897.l4275

Maybe you already have the indicator? If so, need to see all you have and where it will go to give any ideas. How much are you fab-ing? The needle, the shifter itself, just want to mount a PRNDLL indicator? Do you already have the linkage rigged to detent at each selection?
http://www.summitracing.com/parts/idt-2600000010/overview/


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