Did you remove the needles? (while installing guages or clearing them)
If so, sometimes they will 'unstick' and get back to working.. I had this problem with my fuel guage. If this is happening becauase you removed the needles I would remove the ones that are not working (carefully) turn off the car and install them (very carefully) at the 0 (zero) indicator (for the RMPs and MPH guages) If its the fuel guage acting up.. fill it up then do the same thing, but install to the F (FULL) marking..
Hope this helps..
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