Spent the afternoon trying to get the tacho working with not much success.
Thank you Dragon Man for the heads up on wiring connections, knowing the right colour wire to the right connection was a great start and because I have an ECU Tacho trigger wire from the Punto ECU I thought it would be plain sailing from then on....
However, I am still not getting it to work, not even a flicker.
When I put a meter across the earth and blue wire I do get 1.10v at tickover, rising and lowering incrementally with the revs. Does anyone know if this is what you're supposed to get?
I have come to the conclusion that the problem might lie with the match between the existing Panda electrics and the Punto engine loom. I say this because I've noticed that with the Tacho connected, when you turn on the ignition but not actually start the engine, the fuel pump does not switch off like it usually does as the pressure builds up, it just keeps on going. I thought it might be the live connection to the Tacho causing this, so disconnected it but no change, it turns out to be the earth wire. Some how the earth wire to the tacho makes the fuel pump run continuously.
I have looked at both Panda and Punto wiring diagrams but have not noticed anything obvious.
There is of course the possiblity that my eBay purchased Seicento Rev counter does not work, I have no idea how robust they are and it probably hasen't had the easiest of times being posted and as I have trialled various options on fitting it.
Any ideas, help or advice greatly received as ever.
Thanks Guys.