Speederaser talks to any Android cellphone. I suggest this one, but any will work.

ebay link

Advanced Cruise Control” tells your cruise control the speed limit.

1. Following this picture, buy this  board, these resistors. wire it into the clockspring.

2. Get the app and sourcecode.

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Un-maintained version on makezine.

—–UPdate——Nov 2017——–

Due to popular demand, we are now selling one at cost:  Buy it here.