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You gotta do it if you want the timing on the box. If not all you'll get is the fueling of the box. Yes you can hurt your truck by doing this, thats why you install gauges first so you can monitor things. BD diesel makes a pretty nice setup to tap into the pump wire (wish I had known about it before I did mine)
I still don't understand how this works at all. The wire that I tapped into for my Edge hook up was the top wire on my VP44. How the heck does this gizmo eliminate the need to do that?