Hmm... interesting...

My Miata (or MX5 as their known here in the UK) is a 1999 (mk2) 1.8iS - not sure what that equates to in the US, i know that there are different models over there, although i think they have similar spec packages...

My car came with a Clarion Head Unit, which was very quickly replaced with a Sony CD player, and later on the beloved Empeg player & Alpine Amp...

The clarion unit diddnt have MSSS or any other kind of volume adjustment, but im just wondering if that speed sensing wire is in the factory audio harness somewhere... i figure it must be to connect to the MSSS Units? or is it a seperate wire? if not then do you know which pin on the connector it is?

Thanks for the info.. i'll check it out and see what i can come up with...

Richie