Ok, thanks to Simon Johnson for his technical support and Mick Clayton for the loan of his car all day and night, we now have what we hope to be a 100% solution for those people whos rev counters are slow / spurious or just plain dont work in:

Escort Cosworths

Sapphires from 89>

Anycar running an aftermarket tacho.

Unfortunately we cant test a 3door or early 2wd sapphire with this yet so will send out the retrofit solution for now and await their feedback.

Its a very easy DIY mod too. So anyone with problems, contact me on sales@remapping.co.uk and i can fire out the instructions and components tomorrow for Friday delivery.