Fitting a Rev Counter to a MK1 peugeot 106
This is my first one so please go easy :)
My instructable explains how to add a switched Rev counter to an old car without one. My Peugeot 106 has a clock in the usual rev counter place so I decided to fit my own. The reason for the switch is that i did not want it on all the time and it makes a cool addition especially when driving at night
After market rev counters can be purchased from most Car shops, I picked mine of ebay for £10. The missile style switch can be picked up from any hardware store. Messing with your car can lead to you having a broken car. I take no responsibility for any modifications you attempt to make.
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Step 1: The Universal Rev Counter
The universal rev counter came with very little instruction but with only 4 wires it was very easy to work out I will explain this futher in the next step.
Mine came with a switch for a 4 6 and 8 mode. The mode should match the amount of cylinders in your car. This is so that the 4 signals (one to each cylinder) is one rotation. If this does not match your car then the reading will not be correct.
Spending more on your rev counter will get you some extra features like a shift light or changing colours. I just opted for the standard white light one with smoked glass.
WARNING large rev counters on the dash may be against the local road laws check before installing!!!
Step 2: Wire Diagram
The diagram below shows the wiring of the rev counter to the ECU. Check your haynes manual for the right pin to connect it to. For mine it was pin 6 (I have the mk 1)
CAUTION1: I recommend that you put a diode on the signal wire to prevent back current.
CAUTION2: This can also be done to the cars coil pack which is safer! However this gave me incorrect readings so I used the ECU
Red wire: This is the live wire to your battery.
Purple Wire: This is the switch wire; this is traditionally connected to your ignition to turn the counter on when the ignition is started. I soldered this to the primary live.
Green Wire: This is the signal wire that runs from the counter to the ecu. On the peuegot 106 its pin 6 (check your haynes as the 106 has may different ECU'S) this is a mk1.
Black Wire: This is the earth wire for the system.
Step 3: The Dash
The rev counter came with a bracket to attach it within the dash. As you can see from the images blow the 106 is very small and so I had to re-purpose the bracket and screw it to the top of the dashboard.
I used the cavity around the radio to drill into (take the radio out first). The radio is easily taken out with the correct tools and there are already instructables on this. Once out drill a hole down through the dash and widen it enough to get the wires through. Don’t forget to sand for a smooth finish!
The rev counter’s wires had a plug at the back so they could be fed through and then attached to the device itself. “pods” can be purchased to surround the gauge to make it look nicer but I am just going to buy a rubber grommet to smooth off the hole in my dash.
Step 4: Wires to the Engine Bay
This was the hardest part for me as normally you can feed the wires through with others going to the engine bay. However on my 106 these are almost impossible to find even after removing the glove box and most of the dash.
WARNING! Some cars will already have an existing rev counter signal wire in the car. Just use this and save yourself this hassle. You can also use existing live wires.
To solve this, a hole was drilled to feed the live, neutral and signal wire through. This was then filled with sealant (the white blob in the image with the green wire coming from it).
The live and neutral wires were then connected to the battery.
Step 5: The Signal Wire
The Final step is to attach the signal wire to the ECU that black cover slides back to reveal the pin connections.
As i mentioned before on my mk1 it was pin 6. I found this out by getting the haynes manual for my model.