In my case it is to make the interior of the truck look like the stomp starter mechanics are still in place when you have a solenoid equipped starter. The switch connects between 12v "hot when the key is on" to the S terminal on the starter solenoid. That way if you stomp it when the key is off, it won't make the "in gear" truck jump. A little safer than the original setup.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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