Thanks piers.singer. I hope it works good.
Anyway, I think I found an alternative to the zener diode issue. After doing some testing and toasting lead on my "10A" cheapo multimeter (not the first time, and thankfully easy to fix), I found out its really drawing some good current so it would be best to stay away from trying to deal with it at all. So, I've placed a 1M resistor upstream to limit the current being drawn. I'm pretty sure this'll work. The only reason it wouldn't is if the starter solenoid has a lower resistance than the 5V power regulator.
