Jeff's pump [according to phone call earlier today] is a 492.
Pic below shows a CORK FLOAT inside the cylinder & APPEARS to work similar to a VICTORY VIS TOTLIZER on top of cylinder [float inside the VICTORY pushes a geared rod thru the Totalizer to record the total gallons pumped].
Has anyone else seen this on a WAYNE 491-492?
I had a 492 a few years ago that had that identical set up. Never seen another one until now. On mine it looked like it was retro-fitted after the fact.