Hi, thanks for answering!
I just skimmed through the installation manual for the Waeco MS-400 unit (
http://www.waeco.com/tmp/MS-400_EB_10S_03.pdf), and according to the manual there are many ways of getting a signal. Since I have an automatic transmission, I should use a speed signal, not a rev signal, and if it is not possible to get this out of a bus or computer, Waeco provides a magnetic sensor that can get a signal from anything that rotates. Also since it is an automatic, there is no clutch switch, a connector for the brake light is provided, and you can even get an infrared remote control switch and attach it with double-sided tape to the steering wheel instead of fitting a stalk switch.
In short, the manual is there with detailed instructions and appears to have solutions for everything. It still just a little to complicated for me, I don't have the necessary tools and nowhere to park the car while working on it (and, I have to admit, I simply don't have the balls to try
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But why should this be too risky for an experienced autoshop? Does Waeco promise too much?
-Mikael