autometer autogage tach problem

i have had my 5" autometer autogage tach in for about 5-6 months. the shift light is very hard to set because when i touch the dial the needle starts going crazy and jumpin around everywhere. i was told it was the potentiometer that was bad and i need a new one.:shrug:

does anyone know what this could be or have any suggestions?? also can i send it back in and get it fixed or replaced??

any help appreciated. thanks