I have a 2003 PIV and my Water Pressue Gauge does not work now. Assumably it froze over the winter? The dial is all the way to the right and doesnt move. Does anyone know if I can just replace the gauge head, or do you think I have bigger problems that just that to replace? If its just the head, can I get just the head? How do I know what brand / model I have? I assume I need to pull it out and look at the serial number? Thanks Chuck