rear view mirror

[cmc76]

i have seen the repair threads, and mine took a crap a few weeks ago.
But i havent driven my tahoe much, so hadnt paid mcuch attention.
Only my temp and compass is out.
Do they really get $400 + for these things?

 

[malmed]

$50 on ebay

 

[cmc76]

i picked one up used. and the main thing i wanted was the temp readout. which is accurate.
the only thing thats bugging me is the compass is really slow to react. If i unplug the battery will it reset?