Bilge pump(s) -- on/off/auto (Two switches if you have two pumps)
White (all around) anchor light -- on/off Independent of the navigation lights.
And on a separate note, why would you want to use an aluminum plate for the dash? I'm presuming you are going to use your boat in the ocean? Aluminum will corrode from the salt air and salt spray. You may also encounter galvanic corrosion with different metals touching it (like copper for instance) IMHO a far better choice would be Starboard or, if you really want the look of metal, stainless steel.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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