This may help messcort

Taken from another forum:

hi there
im new here but just did my rev counter on my 1.6 chicane
first get some mk6 clocks with rev counter
then go to passenger footwell take off cover and there is the ecu
pull it out (it slides after removing 10mm bolt)
on pin 4 you will see a white and black wire (scotchlock or similar into it
this one goes to pin 8 on the blue connector on the back of the clocks
if you have a spare connecter (scrapyard) you can take the connector out and put it in your plug easily
put it all together and away you go
let me know if you understand as its easy really