What year, etc ?
Could be temperature sender.
Could be power to horn relay.
IMO that's a whole lot of trouble!
Like someone else posted, that's for someone who completely reworking a car. You know - the guys who want a new car in an old car shell.
Where in Del are you? (you can send me a PM if you don;'t want to post that). if you're not far I could run down if needed