It's very common for our customers with 2012 model year Mastercraft models to contact us about using our Mastercraft Piggyback Rear Ballast Upgrade to add additional ballast to their boats.
Unfortunately, for 2012 model year boats, there's no way to add additional ballast that integrates with the stock ballast system. That's a function of the electronics that run the dash system on these boat. The issue is that Mastercraft did not offer the ability to adjust how long the pumps run for on 2012 models, so there's no way to fill additional ballast using the stock system. In 2013 they switched to a different provider for their dash electronics that is not backwards compatible with 2012 boats.
You will need to either use a portable ballast pump based on the bags you select to manage the additional ballast, or install a complete ballast system from us that runs in parallel to the factory system if you want an automated solution.
Sorry to be the bearer of bad news, hopefully that explanation makes sense. Contact a ballast expert if you have any questions.