[TR] Erratic Speedometer

[Geo Hahn]

On Tue, Mar 20, 2012 at 11:17 AM, Hdefer <tr3 at roadrunner.com> wrote:

> ...Haven't figured how to easily calibrate it at higher speeds yet, but
> at least it is perfectly steady all  the way to at least 80 mph.
>


We use a GPS -- I call out the speed as I drive and my wife keeps a charts
of GPS v what I call.  Leave the head unit loose and pull into a parking
lot to open it for quick small adjustment.

Of course the error is often non-linear so perhaps the best you can do is
make it very accurate at a speed that is important to you and settle for
fairly accurate everywhere else.

Geo