Should be simple, I assume the circuit board will be under/behind the dash, positive and negative battery connections on the board, horn wire that was from your steering column would connect at the "horn" terminal. Definitely would use a relay to energize the horn.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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