Does this pulse wire exist on all cars, and if so, where is it on my 2000 Honda Accord?

Thats a very good question!

.. but i have a miata and dont appear to have this wire! (or if i do then i dont know where it is!)

Do all MX5 / Miata's have this signal wire, and if so how can i find it? What colour is this wire? Where does it come from?

Hope u can help! - If i can find it i'll try and put together some kind of circuit to interface it to the empeg, or maybe a seperate attenuator box (sounds fairly easy to do)...

RichieC