if you have installed a S-AFC on an SC400 you will notice that there are

sensor1
sensor2

and you are supposed to hook up the S-AFC to one of the 2 sensors and set the cyl number to 4

i believe this controls only 4 cylinders out of 8.

if you were to hook up another S-AFC to the 2nd sensor would it control the other 4 cyl?
would it translate to greater power gains?

just a theory

by the way sorry to those who replied to my ad and i didn't get back to. had a small house fire.

 

sorry to hear of your losses

Moving to engine section....

 

There isn't a second sensor but it is there for cars that do have them. All 8 cyclinders are being controlled when you select 4.

 

1992 SC400. I see a second sensor wire on the ECU.

 

The second sensor wire would be for a dual MAF car which neither the SC3 or SC4 are.