FWIW... when our boat was finished out the factory bilge pump install scheme was the ($$) Jabsco pump. We have two of those, because the head could then be better-promoted as having showering capability. Actually, the pickup for the head compartment was in the main bilge with a float switch. Having the second 'fancy' pump switch panel in the head would reassure buyers that it was dedicated to that, along with a wrap-around plastic shower curtain in the head compartment.
It was an expensive way to finish out the boat, but then, it was an expensive boat.
I can tell from the location, wiring, and hose routing that this was a standard item. You might wonder if our boat was custom built for the first owner, just as EY would commonly do for all manner of deck hardware. In this case, there is ample evidence that ours was nearly ready to ship, with minimal gear, to be a dealer 'stock boat'. At the last minute they got a request to add a lot of extra-cost options for a new buyer with a super credit rating.
This boat had the primary Lewmar 43 cockpit winches relocated to secondary positions and 46ST winches put on where the 43's were located. (Both bolt patterns are noticeable from beneath.) Wheel replaced the tiller. Full spinnaker gear package added on deck. Likely, that's when the second water tank was added, too. All of this pushed the original price to 90K, per the broker.
Note that the large Whale cockpit manual pump was a "category one" equipment item for offshore prep, common to all of the 80's Ericson's.
While my guesses may be off, unless a first owner or more likely a subsequent owner replaced the factory bilge pump with a centrifugal ('Rule') pump, these boats came with a Jabsco pump. That said, a LOT of owners have been gulled by the overstated pumping performance of smaller centrifugal pumps over the decades. (For a season, until I found water back-syphoning in while in big seas, I made that error too.)
As it turns out, being mislead by a vendor predates the invention of internet commerce.... who knew?