A friend of mine who bought his truck used with this chip already installed had a world of trouble with it recently so after 3 weeks in the shop he sold it. The shop working on it took the chip off and gave to him not marking where anything plugged in. He gave it to me to try and get rid of it and after finally figuring out what this little black box was, other than an Edge Product, I have some questions about it. The guy at Edge Products was even stumped after I described it to him. His boss finally told him what it was, how it plugged in, and the jumper settings. After searching the net I found it is adjustable from 40-90 horses. My question is what settings can be used safely for highway driving without guages?