I had that same problem when I approached MACH 1..... Somehow the shock wave turbulence messes up the EVIC....
Sorry - no specifc answer comes to mind. Might want to check the following tips link to see if you can find it in there....
http://www.sequentialtaillights.com/dodge/Top Challenger Tips and Tricks.htm#MyGig
Always a great resource, Andres.
[FONT="]Tip:25[/FONT][FONT="]
[/FONT][FONT="]Top Speed Display on the R/T[/FONT]
[FONT="] [/FONT]
[FONT="]Depending on EVIC version note the following;[/FONT]
[FONT="] [/FONT]
[FONT="]If you are viewing the "extended" EVIC display and you push the trip odometer stick pin button once, the EVIC will display your top speed recorded since you started the car.[/FONT]
[FONT="] [/FONT]
[FONT="]Also, Gaining access to stored
TOP SPEED in EVIC. While in "digital speedometer" mode:[/FONT]
[FONT="] [/FONT]
[FONT="]DISPLAY TOP SPEED[/FONT]
[FONT="]Press/Hold function select button ">" to toggle between current speed and top speed achieved.[/FONT]
[FONT="] [/FONT]
[FONT="]RESET TOP SPEED[/FONT]
[FONT="]Quickly press and release the function select button when Top Speed is displayed.[/FONT]
[FONT="] [/FONT]
[FONT="]Note, the top speed will not change unless you have it displayed (Speedometer Mode).[/FONT]