HP 9000 works good on 12.5 jd engine. Have installed a couple on 9860 combines and one on a 7300 self-propelled hatvester. Only thing I would like to see on them is a switch to let you select between stock, a low power setting and high power setting like most of the other ADS boxes have. Not everybody wants a full 30 %. Alot of people would be happy with 15 %.