I'm just trying to find the part number. There doesn't even seem to be anyone who thinks these cars had a factory police speedo that went higher than 85, which I doubt.
Kinda annoys me, I've found '60s one-year-only police speedos for Dodges/Plymouths easier, but it seems the Chrysler people are way more tight knit than Chevy guys. There's no single good old Chevy forum, there's no good forum dedicated to B-bodies except for '94-'96 Impala SS forums, and the knowledge base is zilch there. The only person I've found to be of any help with this stuff is beertstr on here, and that's in the whole of my searches on the internet.
I dig this car, I'm still tempted to keep it, but I'm surprised at the lack of B-body togetherness going on on the internets.