2nd Gen Compass Not Reading True

[tfink]

I have a 97 ram with a compass and temp module as part of the overhead console. Original one went dead so I picked one up at the local junkyard. Works but compass is off. Does anyone know if there is some kind of adjustment that can be made on the module or is it a seal unit. I just had my headliner redone. I don't think that has anything to do with, but figure I'd include all the variables that I could. TPF