Hi HT,
I looked up the LM3914's and Bar-graph displays last year,
and the place I checked, quoted that they may
not be available with "through Pins", in the future, (was Digi-Key) so I wish you best of luck, as they do work well. If you are skilled in using SM devices you may find them more available, So order a few spares !
I have installed many of the 3914's, and their cousin the (Logarithmic output, LM3915's, that you don't really want),
I also highly recommend that you install them in matching "IC Sockets if possible".
55 years ago I installed a rectangular strip of 1/2" Clear Plexiglass, that I slotted in the back down its length and then across making two rows of 10 squares, and then drilled a partial hole in all 20 tiny squares, I then mounted and wired 20 tiny lamps to the "Swell pedal contacts of the Wurlitzer Pipe Organ that I was taking care of".
The Organist appreciated the indicators on the backboard, and his audience was transfixed with the lights moving, and constantly asked about them !
, If you can't get the displays, then you could install rows of separate small Led's instead, they will work also. Mel, TheOrganDoc, (BTW I love FL, here on the east coast 25 yrs.!)