On my ARP4 the dimmer potentiometer is fitted: It's in the wiring loom dangling loosely behind the lower rhs portion of the dash. It's just not installed in a way that you can easily reach it to adjust :-(
Thanks Dave, I was hoping there would be an answer like that. I will go and have a search for it later, at least if there is one there it will save having to mess around installing one.
You do have to wonder what the factory were thinking about to just leave it hanging loose?
