I'm sure the answer is somewhere on OSO or Archived, but I cant find a definitive answer. Apologies if repetitive.
I just upgraded my B1 Transom Assembly to a HD assembly. I really need to know exactly what I need to keep my trim gauge\indicator working. And, hopefully, where to get it! Thank You!

I think you have to run cables and indicators, no electrics on hd type

correct,and we all like to keep track of our TRIM

im not sure if it is available yet,but at least 1 of the major gage companies is developing an electric gage for this and the only thing that will need to go through the transom is a pair of wires.