Thanks again for the help. I just finished the install (still need some photos) and it went very smooth. I unplugged the original wires and determined which was hot and which was negative. I mounted a six-pack fuse block and the relay in the recess/space next to the battery for all my connections. I used the fuse block to connect some of the other accessories that were attached to the battery like my 12v power source. I fed the wires through the hole in the battery recess where one of the battery cables passes through and connected the negative to #85 on the relay. I attached the hot lead from the car's original fuse block to #86. I used 12 gauge wire to make the rest of the connections. I ran a new hot wire from the "new" fuse block to #30 on the relay and from #87 to the horns. I used 12 gauge wire to ground the horns to the frame. I used shrink tubing and the connectors with the shrink tubing built in for all the connections.
I fabricated some brackets out of angle braces and a heavy metal strap from Home Depot. I drilled a larger hole in the angle brace and used one of the bolts from the bumper bracket to secure it to the frame. I bolted the heavy metal strap to the angle bracket with stainless steel nuts, bolts, and washers and attached the horn to that with more SS nuts, bolts, and washers. After measuring everything up and cutting to fit I took it all apart and painted everything black (except the HELLA horns). The shape of the bracket allowed me to center the horns both vertically and horizontally behind the chrome horn grills. I reassembled everything, zip tied all my wires tight, and tried them out. Let me tell you they are loud and very cool sounding with the high/low tones. Very Eurpoean sounding.
No one will miss my little Speedster now.
You can see the red HELLAS behind the horn grill and they look real good. It was too dark for photos last night so I'll post some when I can get good pictures of everything.