I just got my Jaycar Electronics Speedo-Corrector from down-under for about $50 delivered. The speed corrector comes in a kit form with everything you need to put it together along with instructions how to make the necessary adjustments. The board measures 4 1/8" x 2 3/8". I asked Tweety if he could supply my a PCB smaller than the supplied board as there is a lot of additional room on the board that can be removed to reduce the overall size.

I will post pictures as I complete the build and install and make the speed sensor correction.

For more information about the kit, http://www.jaycar.com.au/productView...5&form=KEYWORD

Here are some pictures of the kit.