dont quite know why you would need to remove the needles to change the color... Either way, in response to your question, no, they would not be accurate still. They would need to be recalibrated.
98 Corolla LE 1.8L DOHC 1ZZFE
TEIN H.Tech Springs
Tokico HP series Struts
Short ram air intake
Tsudo Axel Back Exhaust
... if a jelly fish stung me.. would you pee on the wound?