I don't know look up gauges savers and maybe they can fix and reset them. I bought them because I repowered and was just going to wait until the engines reached 100 hours but I did not realized they were bigger:(
I installed the Perko flush pro valves on my Amberjack, the hose connections were already installed on my transom and they work great, they only flush the engine not the outdrives. Just had my second new engine installed with full freshwater cooling....