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Originally Posted by Lyle O

OK now, this looks like a winner. Can you show a few more details on how you did this? I assume my '87 has the same sensor wiring set up as yours (2-wire inductive coil). How did you connect to the box with the harness you made (do you tap it at the trans, or at the speedo)? From the website, it seems like an electrical neophyte like me can even do this. Thanks for finding it!

Correct, all the 915 trans equipped, and I would assume the G50 trans cars as well.
I made a "harness" that taps into the existing wiring by adding a spade and 2 female crimp for each power connection. Its really so simple its goofy. Tap into the +, - terminals with the 1in 2out, part of the "harness", then take the sensor output and attach to the yellowbox input and attach the yellowbox output to the speedo. It is intuitive once you start looking at it. The speed compensation details are crazy accurate. The Aussie's love to mod their cars and this isn't really a suprise.