ED, While I have not and will never use them, from what I have read on other forums, they defintiely meet the criteria of "you get what you pay for". In fact, those gauges are nicknamed Glowsh*t gauges... . while occasionally someone installs them and has no complaints, and even raves about how cool they look, I would venture that at least 50% if not more report problems with the pyros or sending units or lighting or gauge accuracy, etc. While Glowshift has a warranty and generally keeps sending out parts for replacement, IMHO they are not worth the trouble of installign and replacing. If you do a quick search on cumminsforum, you can read many threads, a few positive and many negative.