Mercedes W124 - How To Fit Plasma Dials
Left sector. Look at the pictures below. There are a few parts on the plastic base, marked with red, which need to be removed. The new plasma dials are much thicker then the stock dials. If you leave the base like it is, your new dials will not sit right.
Install the speed dial first. The cable goes between the coils to the left.
Then install the last dial. Put all needles on the previously marked positions.
Take the plastic cover. Clean it. Now find a good place to make 2 small holes on each side ..just enough for the cables to go out.
Reassemble the gauge cluster. This is how it looks now. Make sure, that the odometer reset button works fine.
Secure the wires with double sided tape or insulation tape. This is a security measure to prevent you from pulling the wires during wiring, which can cause damage to the plasma dials connectors.
Now lets start with the wiring process. Each glow foil has a plus and minus wire. In this case we have 3 glow foils , with 3 minus and 3 plus wires. It doesn't really matter how you connect the wires at this step. The glow foils have no polarity and if you change positive and negative, they will work anyway. An electroluminescent foil is not going to work, only in case, that you connect its own plus and minus wires with each other.
Here is a picture of the power inverter. You see there are 3 plugs with connectors. Since we do not offer the female connector at this time, you have to make the connection between plasma dials and power inverter permanent. Pick one of the 3 white wires ( some inverters have just one plug or more them 3 plugs ). You can use them all, if you think it is better for you. Cut the connector. Connect the white wire with the plasma dials. There is again no polarity here ... doesn't matter how you connect the wires, the plasma dials will get power. Solder the wires. USE PROPER INSULATION MATERIALS!!!!
The only thing left to do, is to supply the inverter with 12 Volts power. The Red wire is plus, the black one - ground. As a 12V power source, you can use a bulb slot. In this case, we recommend you to power the dials from the lights switch.
Good job! Enjoy the final result.