If you were to get a switch like what's in the link below, and put it in place of your present bilge pump switch, you'd be able to have one switch that manually starts the pump, turns all pump power off, or turns on power to the Auto feature
http://www.amazon.com/BEP-SPDT-Lighted-Nylon-Toggles/dp/B07B6N6LKV" rel="nofollow - link
It has a lighted handle like your original switch, but being 41 years newer it won't be faded like the original
That would work with your present pump
You could also use the unused switch right above the bilge pump switch to supply the Auto function.
(from the factory it came with power supplied to it but hooked to nothing, for use as an accessory switch)
That way you don't have to buy or change anything. With that switch ON, your Auto feature works, with it OFF then you can use the Manual switch.
Either way, not knowing what's been done wiring wise over the years, you'll have some investigating to do.
There are a variety of ways to make it work in Manual and Auto but these let you turn off the Auto function
Or...............you buy a new pump whose Auto wire can be hardwired to the battery with a fuse and the Manual wire hooked to your present switch on the dash.
Here's a link to one available at a variety of places that works good. It's got a magnetic float switch in the housing, has a time delay when shutting off in Auto and is 800 gph which is plenty. Not for direct wiring to battery though
http://thmarinesupplies.com/products/automatic-bilge-pump?variant=16029955784747¤cy=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gad_source=1&gclid=Cj0KCQjw9Km3BhDjARIsAGUb4nwYDzEHFOxBB2i0edQUenShtXcsUPliisWC1amNttZHTYW4mMyeHHkaAv4-EALw_wcB" rel="nofollow - link
Red wire is for Auto.............instructions with pump show it hooked to an ON-OFF-ON switch, but ON-ON works just fine.
Brown is for Manual ............hook to your switch on dash
Black is to ground
Choices, choices
I'd go with the last choice, I've had good luck with that pump, better luck than some higher priced more well known brands that I won't mention.
But any of the options above will work.
Note Edited to delete any reference to hardwiring the Auto function direct to battery.
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