Figuring out Christmas presents is going to be easy in your household this year Rick.
Any idea as to what you did specifically to get the tach going? Did the Terminals look corroded?
When a chain or rope is paid out to the bitter-end, no more remains to be let go
I went down and dirty. I took a small piece of aluminum and drilled it to match the bow eye threads. Slipped it on and secured with two Nylok nuts. It works and it's out of sight.
Side comment regarding anchor lines... as part of the yearly maintenance on the boat, it's good policy to end-for-end the anchor rode. Same theory as rotating the tires on your vehicles; evens out the wear.