Instructions for hooking up Mileage Master.

I bought this Jacobs Ignition Mileage Master a few years ago off a guy on craigslist, and I'm finally getting around to installing it, but I don't have any Instructions. I checked Jacobs site and they have instructions listed for a mileage master, but their newer ones look different than the one I have (newer looks like a log, mine looks like a brick). I'd love to get DUI, but that isn't in my budget at the current moment. Any directions/help on this would be greatly appreciated.