You need the Lasar timing box, the proprietary serial cable to attach to a computers serial port, hyperterminal software, and the list of trouble codes. It helps to have the Lasar manual. There is at least one wiring mistake in the literature. Joe's a great guy, and is about your only tech support left. At least he doesn't disappear to SunNFun when you need help troubleshooting a broke down airplane. I got rid of mine a couple years ago, and my last information had the control box cost in the neighborhood of $4000, and the mags in the $2000 + range. If you can find them. My control box had an issue. I had two sensor mags that came apart inside, and a bad starter switch contact that caused another system failure. After the second sensor mag, with less than 200 hrs, I'd had enough. All this being said, some folks have had great service. It's a great idea that never got the support and further development it needed to become an honest trustworthy system. Would I have another one of these orphaned dinosaurs on my airplane? Never. I spent thousands, and I still couldn't trust my airplane away from home. All things considered, it was a costly mistake for me. You need to learn the system for yourself too, cause the average JoeBlow mechanic will only scratch his head when you tow it to the shop.