When I did mine two years ago, Hydrophase was offering a $100 rebate if you documented your installation and gave the info back to them. They were trying to build a catalog of installation instructions and photo examples on different boat/engine types.
Not sure if they're still doing this, but if you do opt for the dealer to install it, see if they would take photos and document the process for you? Of course they might wind up charging you for that extra time and the $100 rebate might net out.
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