I have toggle switches w/ little LED lights on them...red for fuel, blue for water pump, green for fan. Having the lights on them makes it easy to make sure they're on w/ a quick glance.
Just cheap ones from the parts store, but work great. Keep a couple spares in the toolbox just in case.

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CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax