Installing electric fan need help

[H2Ogbodies]

That kid at Autozone doesn't know what he is talking about-1982 Montes did not have a switch-that is a sensor. You need a 1-wire switch that allows a path to ground once the desired temp range is reached-thus completing the ground circuit @ the relay to kick the fan(s) on. I usually look in their Wells engine management book under "SWITCHES/SENSORS" and look for a single spade switch with the right temp range and then it comes down to what thread it is-ideally you want 1/2 NPT but usually you find 3/8 NPT or 16MM. O-Reilly's carries Borg/Warner electrical engine management-they are pretty extensive-try those guys. As a last resort, go to NAPA-they have their own line, Echlin.
As for the dual fan setup with relays...sigh, I know what you are thinking-man, pretty cheap and they fit great, right? Besides the fact that they do fit a standard gbody radiator nicely, that's the only good thing. The pancake style motor is low profile which means not a lot of motor windings which results in a high amp drawing fan with a crude blade pitch. Translation: it is okay imo to use on a stock motor, not a HO one. Or, if you've swapped to R134 AC, not a good fan choice either. A nice cooling system centers around proper shrouding and airflow...it's always better to have a high powered fan that is more than up to the task and then you can dial it in. If you start with a weak fan by design, you can't dial it up as easy if you need to. As always though, cost can be an issue and space even more so. I did a 377 in an S-10 truck and I tried like heck to get a Mark VIII fan to fit but ultimately I had to go with dual 11" Spal fans-then, I needed to trim the center shroud support to clear the water pump pulley on the serpentine system. Money wasn't the issue but space or lack thereof was. lol.