maybe its nothing to worry about

but ive got this vacuum gauge and its been there for about a year it measures from 0-30 it always used to go up to 25 with accurate speed its been like 2 months now even on a cold night the needle moves slowwwwwwwwww..does this mean there is a vaccuum leak or can it be just the gauge went faulty? any ideas appreciated :thumbsup:

 

vac gauge

would check the connection at the gauge itself, might be abit loose or something