It's part #272-1092.
Here's the link containing instructions:
http://www.odyclub.com/forums/showthread.php?
s=f68dff7d552bbb0bd59c66d0d8be4b5b&threadid=23429

The above forum is much better than this one.
--- In hondaodyssey@yahoogroups.com, "dhb63" <dhb63@...> wrote:
>
> Could you list the Radio shack bulb numbers to save us some time
> when we walk into the store? Thanks in advance, Dennis
>
>
> --- In hondaodyssey@yahoogroups.com, "bplee66" <bplee66@> wrote:
> >
> > Thanks, yes I found the step-by-step instructions on another web
> > site. It does take about 30 minutes to remove the dash assembly
> and
> > instrument panel cover. I also ended up replacing the light on
the
> > hazard button. Got the replacement lamps from Radio Shack for
> around
> > $2 for 1 pair.
> >
> > --- In hondaodyssey@yahoogroups.com, Mihai Pascutiu <pascutium@>
> > wrote:
> > >
> > > I did change it myself, it's a pain but eventually it worked,
> took
> > around 30 minutes. Do a search for messages describing the
> procedure
> > in the group: http://autos.groups.yahoo.com/group/hondaodyssey/
> > >
> > > Good luck
> > >
> > > dhb63 <dhb63@> wrote: By the way
> > the clock light should be on all the time. The parking
> > > lights/headlights dont effect whether it is on or off. I
belive
> it
> > > turns on when the key is turned.
> > >
> > > --- In hondaodyssey@yahoogroups.com, "bplee66" <bplee66@>
wrote:
> > > >
> > > > I have a 2000 Odyssey. The light on the digital clock
doesn't
> > work
> > > when
> > > > the parking lights are on, so I can't read the clock when
> > driving at
> > > > night.
> > > >
> > > > Has anyone here replaced the bulb on their clock? If yes,
did
> > you do
> > > it
> > > > yourself or take it to the dealer? I'd prefer to do it
myself
> if
> > > > possible.
> > > >
> > > > Thanks,
> > > > Brian
> > > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > ---------------------------------
> > > Be a better Globetrotter. Get better travel answers from
someone
> > who knows.
> > > Yahoo! Answers - Check it out.
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
>