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I've had mine up to the odometer trip button. I don't know how fast that was, but I've had it up to 101 according to gps unit and that was about 1/2 way between 85 and to odometer trip button.
mine ive had up to 110 106 103 102 and over 85 tons of times i have a stick so my tranny didnt blow (assuming you guys have a4ld's) get yourselfs 140mph spedos just get the speedometer itself and just take your speedo out of its cluster and put the 140 in afterwards its quite easy believe it or not.