would guess (just a guess) that the switch on the dash is to wire a standard bilge pump. However, either the factory of prior owner installed a float switch bilge pump and bypassed the dash switch. You may have a choice if you ever need to replace the pump.
The good news is that it does pump. So you know that if it is not broke, don't fix it.
You may use a tester to find out just where the hot wire on the dash switch terminates (what it is connected to or if it is connected to anything at all) just for curiosity. It may be available for another gadget like an electric downrigger or color fish tv.
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