A 'How do i do this' question

[Tris]

Hello All,

First post here after finding this site via google, so hello to you all and hopefully i will be able to find some help with my question.

I need to create a 'circuit' which monitors 7 individual voltages, and depending on which of the 7 voltages was the lowest (compared to the others), produces a single output signal which alters in voltage depending on which of the 7 inputs was the lowest.

For example, if input 1 was the lowest, the output voltage would be 2v. If input 2 was the lowest, output would be 3v. etc etc. This is for a car application, so everything needs to run off 12v.

Could anyone give me some guidance or any idea's where to start ?. I have got a electronic background (although many years ago), so i can hopefully muddle through most things.

Cheers and thanks for any help.
Tris