got my TAZAR DT installed and adjusted for my 35" BFG's. Not BAD but definitely not exactly plug n play per the directions. Does it's job. I must calibrate per the highway next week but is really really close per my gps. MY number was 34.5" per BFG website. IIRC there is a 34.4" selection in the menu as well. Better than the 9% overspeed compared to the speedo!