VSS in Stripped Rock Krawler

it looks like all you want to do is step down from 12 volts positive to 5 volts positive to power up your pulse generator, this should work, go down to your local radio shack store and get a cigarette lighter adapter that puts out different voltages, they usually put out anywhere from 9 volts to 3 volts, set it on the right voltage you need and you should be in business, you might want to get a female cigarette lighter plug also so you can hardwire the adapter and stick it behind the dash somewhere.

hope this works for you, good luck, steve