The advice you gave is the same regardless of car though - there is a green wire which comes from the coil itself to the rev counter, we plugged it in knowing it would double read and if you split it in half it's working correctly.

However, that doesn't mean that there isn't a problem with the rpm signal wire going from the coil to the ECU, wherever it may split off (I think it's pretty close to the coil itself).

Anyone else know anything more about that?

Cheers,

Andy