OK I picked up a heavy duty momentary switch on the way home, good for up to 25 amps. The good news is it will fit perfectly in the vacant hole for the parking brake warning light under the dash. The new plan, since it will only be used for priming when the button is pressed, is to wire it right off the battery positive through a 10 amp in line fuse, and bypass the ancient factory wiring. Probably won't satisfy some of you but should do the trick.
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