Got mine on Ebay look under volvo penta trim sender 3849411. It has three wires but only uses two. When I replaced mine I used a little bit of grease to slide into the transom hole went in fairly easy. There is a little clip on the inside that holds the wire tight against the transom don't lose it and be aware that it's there
. I also removed the pickup hose to make getting the to the wire easier. I set the sender to 11 ohms then installed it into the drive when it was in the fully down position then adjusted where the needle on the trim gauge was pointing to down.