Dash Lights go off/on intermittently (Attn: hyundaitech)

Hey.
I have a 2001 Accent with approx 57000km. Recently my dash lights
(speedometer, oil temp gauge, revs) have been going off an on
intermittently while driving. I figure taking it in the the shop will
give me some run arounds since wiring issues can be extremely
difficult to find so i figure someone here may have had a similiar run
in. The lights could work for 20 mins no prob and then be off for 20,
could work for 5 then off for 30. There is no rhyme or reason as to
the operability issues. Speed, road conditions etc have all differed.

I found the following thread while searching the newsgroups for a
similiar problem that somewhat explains my issue: http://
groups.google.ca/group/alt.autos.hyundai/browse_thread/thread/
b67a54075e117739/d6f670c5050a5a8e?lnk=gst&q=dash+lights+go
+out&rnum=1&hl=en#d6f670c5050a5a8e

Any other ideas besides the inverter? Any ideas what the inverter
would cost? How long to install?

Thanks for all your help!

 

Help someone

Please!