Wow does it really say H.O. on the side or are you making that HO part up?My 06 Chevy with the H.O. D-Max tach states a redline of 4500 RPM. I've tried running it up to 4500 but it seems to catch a rev limiter @ 3500 RPM. Is the 4500 redline on the tach just a pipe dream or is there something wrong with my truck?