I found this scroll wheel and have no idea what it does. My car is a 2000 jaguar s-type

 

Looks like the INST PK lighting control dimmer.

bob

 

I agree Bob, although I had to look at mine to confirm.

 

+1, that's the dimmer switch for the Instrument Pack

 

Welcome to the forum anonomous person101,

I've moved your question from General Tech Help to S-Type forum. This is the place tpo post questions about your model.

Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.