Hi
I fitted a set of instruments with a tacho yesterday. This is what I had to do to fit the instruments to a 94 1.0L. Fit the new instruments and plug in the speedo cable and electrical socket. There are two thin wires that exit sleeving briefly before going into the top of the dizzy. One (black on mine) comes out of the sleeving and is then connected to what looks like a capacitor, from there it goes to the dizzy. The second (black/blue)comes out of the sleeving and then goes straight into the dizzy. I scraped some insulation off the blue black wire and soldered a wire to it. I slipped inside the sleeving and then led the wire to the grommet where the speedo cable goes through the bulkhead. I pulled the grommet out, pushed the wire through the centre and taped it to a rod that enabled me to push it trough the hole and straight out of the front under the steeing wheel avoiding the pedels before replacing the grommet. Then working inside the car, took off the bottom and bottom right console covers, then led the cable to the left out of the way of the pedels and taped the wire to the cables in the thick sleeving. There is a blue/black wire that comes down in that same sleeving from the tacho and can be seen for about 4 inches before going into a multi-pin plug that pushes into the white multi-plug housing. Scrape off some insulation and solder the other end of the new wire to this bared wire, tape up und you have a working tacho.
The only problem that I now have is that the tacho under reads by perhaps 15% and the speedo over-reads by approx 20%. This leads to a question- is there any difference in the ratio's between the various instruments that were fitted to micra's?
Any comments on this? There have many questions hinting to this is previous threads, but no one as far as I can see has actually posed it.
....coming from an aero eng uni student 
