[Trickycoupe]

I wired the adapter to the 12v + feed that supplies the coils (all 8) per Autometer detail for coil on plug.

The tacho model is RVC2816-00CB

Will have a look at doing a temporary wire to a single coil negative and set dip switches on the tacho accordingly to see what i get. I have read that that doing this way gives erratic signals but have not tested myself yet.