New owner help 09 sv240

[09CenturionEnzoSV240 0]

Hey guys! I purchased my first wake boat last week, an 09 Centurion Enzo SV240. I have a few questions. I bought it from a non-centurion dealer with 105 hours on it. She's beautiful, and I was told everything was functioning perfectly, but my first time out, the speedometer isn't working. It says 0mph until I really accelerate, and once I approach top speed it trickles up to 10-12 mph shown on the speedometer (although I'm clearly doing 35+). The dealer is supposed to look at it, but they're dragging their feet and handling it in a less than professional manner. Any idea what the issue might be?

It has the scorpion 377, and 5 hard ballast tanks, 1 center, 2 mid, and 2 rear. I surf goofy and ride the right side of the wake (the driver's side, is that the starboard side?) The other side of the wake is noticeably cleaner, I'm told because of the prop rotation. Any affordable ways to clean up my side? I'm hoping for an affordable but effective wake shaper recommendation. 

Thanks in advance for your help!!!