Need to wire up an electric fan on my 360...

Important Facts:
1. I'm clueless
2. I have a 1974 360 with 4spd, no AC.
3. The bare minimum of wires are hooked up to run the vehicle... nothing else. Many wires are probably completely missing and so is a lot of the standard equipment.
4. I feel I may have to buy something to make this work, but I'm not sure what. Its not a show car, but I don't want to make it look worse than it already is. I don't have a rats nest of wiring and would like to keep it that way.
5. :violent1: help?


I have an electric fan installed on my radiator, but.... omg there is electrical work to be done. Here's the instructions from the outfit that I bought all this from...

"you can use a standard automotive relay from most auto parts stores. The coil or control circuit of the relay should be connected to a key-on 12 volt source so the fan will not run after the key is turned off. You will use 4 terminals of the relay. Terminal 30 will be wired to a 25 or 30 amp fuse from the battery, starter solenoid, or horn relay 12 volt distribution point. Terminal 87 will go to the fan. Terminal 85 will go to the key-on 12 volt source. Terminal 86 will be wired to the coolent temp switch in the manifold. Here is a diagram. Disregard the wire colors.
[FONT=arial, sans-serif]If you have A/C, you can wire a trinary switch to turn the fan on when the condensor needs more airflow. If you don't have a trinary switch in the A/C system, you can use another relay to control the fan relay from the compressor clutch circuit.[/FONT]"


The diagram is fun unfortunately I couldn't copy it inside the instant message I received.


From the diagram, it looks simple enough, just I don't know what all the parts are.


From the battery I need a positive red wire going to a 30amp fuse which goes to.... a relay? This relay has a yellow wire going to a sending unit (I'm guessing thats the heater sending unit on top of the intake manifold. And there's an orange wire going to the ignition. So is this relay already on my car? Where do I find the orange wire? And I'm pretty sure I have no wire on my sending unit right now, (my gauges do not work). And then there's another red wire comming off the relay which goes to the fan (the fan BTW has two black wires, I'm guessing this means the fan doesn't care which way it gets voltage, but I'm also guessing that if I choose the wrong one my fan is going to spin backwards).


And then in the diagram there are instructions for a override switch... Why would I want this?