It all started when I tried to install a rev counter in my Panda (clasic). I found very useful inforation in the forum and it was prety shure that if I take the singal that is needed for the rev counter from pin 23 on the ECU everything was gonna be ok. But pin 23 in my case didn't give me the signal. I tried to connect the rev counter as it was described in the installation instructions by the manufacturer but I had only the half reading beause the engine is equiped with 2 coils so 1 coil per 2 cyliders is half the revs on a 4 cilider measuring tachometer.
What we need
- a legth of 2 pole cable (i.e. speaker cable)
- two 6A diodes
- some cable ties
- 3 plastic clamps (with screw on top)
- some insulating tape
And then...
You have to deside if you want to take the signal from the coils in the engine bay or from the other end of the coil control singal cable on the ECU connector under the dashboard. I prefer the 2nd because I don't have to wire in the engine bay and feed it through the bulkhead in the cabin and also you don't risk the waterproofing of the coils connectors. If you deside to do it like this remove the connector of each coil and put the cable inside the (-) terminal hole and hold it there while putting the connector back. feed the cable near the place you are going to put your rev counter.
If you choose to take the sigmal from the ECU you have to open the connector by cutting a cable-tie that holds the "neck", removing a skrew from the side and gently sliding the top of the connector out.
Then locate pins 1 and 19. There are numbers on each side. They must be the two first on each row as the cables go in the connectors and the cables must be white-green and white-black (not green-white or black-white).
Now you can put your cables in the holes on the side of the connector and hold them there with the two pieces (that came off when you removed the connector's cover!)
and reaseble the connector.
Now feed the cable near you rev counter and put the ends into the plastic clamp or connect them with anything you prefer to the (+) of the diods. Connect both (-) of the diods to the rev counter signal cable, put some insulating tape around and you are done!
If you are not shure how to connect the diode try both sides on one signal cable. Only one should work. Connect the other the same way.
Make shure you have connected the power to the tacho!!
Now your rev counter shoud work showing the correct revs.
