93 ranger xlt 5 speed 2.3L it use to say the right temp but had to pull the needles off the gauges then when I put them back on all of them work and say correct stuff except temp it just gets in the middle of the c so drove it for a HR then pulled the needle off again and started the truck (still normal temp) then pit the needle back on for it to read in the normal line then shut it off and turned it back on and its messed up again any way to fixed this?

93 ranger xlt 2wd 2.3L 5 speed