Clicking Behind Spedometer

[350VortecSSCT]

Alright, First problem in a LONG time for my TWO DOOR TAHOE! I put my truck in drive and I accelerate over 10mph there is a clicking electronic sound, and its faint but only happens every two-four seconds. it stops when I stop but comes back when im accelerating...HELP@!

 

[DRAGGIN95]

It sound's like the servo motor in the either the speedometer or the tach is clicking, for an easy fix I would swap cluster's, but you could probably change out the little motor.