Alright guys i know this has been answered 10000000 and 1 times but i cant find it anywhere. So heres my problem: Got everything down except for where to hook up the low and high speed so the ecu knows to turn it on im ok if i can only hook up 1 or the other i figure on the coolant temp sensor but i dont know which wire to plug into so any help would be appreciated. Thanks

 

i wired mine to run with the ignition so its always on.. it works fine i know most will say its too much stress on the alternator but i havent had any issues

 

There is no way to have the stock ECU turn on the fan...you have to add a thermoswitch to the cooling loop to do that.
You can notify the ECU that the fan is already on so it will use the BAC to stabilize the idle.

@Spectrum...
Ignoring for a moment the extra current draw, it's just silly to run the fan "always on".
You now have the fan and the thermostat fighting each other.
One point for the efan is the more precise control you have over the cooling cycles, an advantage you've ceded from the git-go.

 

www.aaroncake.net He has info on how to install an Efan on an FC.

 

i tried using aron cakes diagrams and write up but it doesnt exactly go into where the 2 speed fans hook up to get power on them.

 

A two-speed fan will need 2 thermoswitches (or one w/ 2 stages) and 2 relays.

Clokker's threads: https://www.rx7club.com/2nd-generation-specific-1986-1992-17/ford-taurus-2-speed-fan-wiring-827375/
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/na-efan-install-687704/