Blue bulbs for my '66s gauge

Anyone saw any blue bulbs for the early model gauge cluster? I wanna have mine glow blue to go with the ext/int of the car. I cant find any though...I did it to my '77 1/2 ton but that uses 194 lights so it was easy...would even wrapping them in saran wrap work? Or would that just fall off after time or somethin?
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walmart has testors trans blue and red in the spray can, and that is a good tip was wanting red dash lights and couldn't figure out how i could get them now I can do it may do it tonight.