Shielded wire is basically a wire that has a sleeve around it that you can ground at both ends (so that you dont get interferance) its not a MUST but it helps alot.
You can get the shielded 2 core wire for the pip/saw from Jaycar electronics (couple bucks a meter)
You time it using a map, rpm vs load... you can start with a basic map from someone else, and then tune on a dyno/rolling road to get it perfect for your motor (each motor is different)
You have been to the Autosport forums right? Heaps of info about maps, etc etc on there... get it installed and you can actually download peoples maps (eg/ Aldon Dizzy map (yellow, etc) or peoples custom maps, etc... but I would always check it on a dyno to be safe.
If you unplug the Megajolt and just run edis it will run in 10deg btdc as a 'limp home' mode... so if your worried, run it that way to get to the dyno, then plug in megajolt and tune from there.
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