Hi, I have a 2009 Sea Doo GTX IS limited 255. I had a gold star tech install a brand new IBR unit this spring because the old one was throwing the IRB light on because of the water sensor. Anyway, the new IRB seems to be working fine, but the water depth gage is giving me inaccurate readings. when I can see the bottom, it says something like 85 feet and when the bottom is no where to be found it says something like 3 feet. Does this thing need to be calibrated or something?