Decided to give a dashboard camera a go, and went for this one after a reasonable review on Youtube from Techmoan. Cost me £40 + £5 postage, does 720p video at 30fps, including sound. Also has a G-sensor to tag "events" which might be collisions.
You need to provide a ground, and a 12V line that is powered when the ignition is on. Typically you take this from the radio headunit, but happily my 406 had an unused connector in the headlining that had 12V and ground!
So here goes. First, remove the interior light unit:

Then undo the Torx screws and remove the overhead console. That orange connector is the one we'll be butchering:

Take the red (12V ignition) and green (ground) from the connector and cut them, strip them, and insert into terminal blocks:

Tuck all the unused cable away, cable tying to the plastic so that it doesn't rattle against the roof, and replace the console:

Done!

And here's the test drive video. Be sure to change the quality to 720p!
http://www.youtube.com/watch?feature=pl ... _4dTE&hd=1