On the back of the dash unit. It's been a dozen years since I repaired one
of these.

I have no idea of your mechanical skills. Seems simple enough to me, I've
seen people break the dash trying to work on them so can't say if it would
be easy for you.

I'd probably charge a couple of hundred bucks to do it just because it would
take some time doing research to find where it is, how to get it apart to
replace it and dig up the repair parts + actually do the repair. We are at
$75 an hour if that helps you figure out how difficult this will be to deal
with if you ARE good with mechanical things and understand electronics.