[Frank15]

This has been posted on various Mustang sites before, any '99 or later model will do it.

Our digital odometers have a neat "easter egg" built in.
If you hold down the reset button as you start the car, it will display "test"
Release the button.
Press it a couple times. It goes through a couple tests where it sweeps the gauges and illuminates all the dash lights.
After a couple more times, it will say "Eng 0000"
Drive a bit. You'll notice it is giving you your speed in mph!
Hit it again, it says "M 0000" This is your speed in metric, or km/h
Then hit it again, and it will give you your digital tach readout!
There is a bunch of other stuff it displays as well. See this reference for more information: http://www.mustangworld.com/ourpics/News/99hec.htm
When you turn the car off and on, it goes back into "normal" mode. Its a pretty fun trick. Also useful to have your digital speed readout sometimes. You'll notice the analog speedo reads a mph or two faster than the digital speedo...

 

[chilli bullitt]

Hve to amke sure Dona sees this right away or else she will think we were hiding it from her!! :lol:
Cam

 

[donwil]

The only thing I hate about this is that it resets your trip meter back to 0.

 

[Frank15]

Actually, I've managed to do this without resetting my tripmeter on my Mustang. In an F-150, it always seems to reset your tripmeter. I guess if you don't have it set to display the tripmeter when you start it, you can get it to not reset.

 

[5111]

It has not reset my trip meter either, but I never have it set to that when I start.