Quote:
Originally posted by jluetjen
Sprint;
As far as getting 12V in the engine compartment, that is easier then you think. Check out this picture...
The copper colored screw pointed out on the left always has an unswitched 12v's going to it, so it is hot even when the engine is turned off and the key removed from the ignition. 
It's tied to the fuses pointed out on the right which are in the same condition. I took my 12V from the screw.
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That terminal wire is a bit light for powering the MSD unit. Remember you are sharing it with the accesories it was designed (and sized) to power! The MSD presents an incremental load beyond its design intent.
An easy way to get unswitched battery power is from the starter solenoid.