Hi Fish,

I installed a trip computer (which a got in the breakers yard) in to my
1998 406. I think the same will apply in both cases. My car wasn?t wired
for the trip computer, well not for all the functions. The car was wired
to display Radio & temperature only (I had to add temperature sensor to
passenger door mirror which I got in the breakers yard too). I read the
wiring diagrams in the Haynes book (I think newer model isn?t covered in a
Haynes book) the trip computer required five additional wires, four of
these wires only go to the instrument panel. I did some DIY and as per the
Haynes book connected in the additional wires, I later learned of the fifth
wire from this site, this wire is not shown in the Haynes Book, it?s
between the main ECU and the trip computer. The wire is numbered as 1368,
this wire gives live data on the fuel flow through the injectors, don?t
know the terminal on your car?s ECU connector, but you can look to see if
it is there. It is best to check this before going any farther as my ECU
does not support a connection to the trip computer. Google ECU make and
model (this data is I think on a sticker located on the ECU).

Check these links for more info.

http://www.talkaboutautos.com/group/alt.autos.peugeot/messages/46914.html
http://www.autoelectric.ru/auto/peugeot/406/p8c/p8c.htm

Best of Luck

Bryan