Bill, thank you for all your help. Your experience has been super helpful. I got all of the original books for my 1975 50 HP evinrude. I took it to an Evinrude technician for running and he said it was in good shape and clean, running well. I got a new horn for the temp sensor on the remote and am super happy.
Bill, I installed the CMC 130 on my boat, works like a charm, I will soon do some sea trials.... Thank you for all your help and advise. I got all the original manuals, and had an Evinrude trained professional tune it for me, after running it to ensure it’s running well. Very happy.