I have a 2013 Response TXi. The zero-off head unit is fading in the heat and is difficult to read. I am going to replace it and do the single puck upgrade at the same time. Anyone have any experience changing out the head unit and with the single puck change on a response TXi? Any guidance on how to replace the head unit would be appreciated. Also, if anyone has guidance on drilling into gel coat to make the larger hole, I could definitely use some guidance. I searched and couldn't find anything. I also posted on Malibu Crew and so far no reply. Thanks!