[Aeroscout977]

I don't see an A/F gauge working with a zirconia O2 sensor. You'll need a wideband A/F sensor for it to hook up to. I don't think Honda switched to A/F sensors until the 2000's. Could be wrong of course but I'll look up the schematics for you tomorrow. I'm guessing it's a 1993 del sol? =P

 

[Aeroscout977]

The ecu always needs a reading of A/F. All i need to know is which of the four wires on the o2 sensor is the signal wire out of the 4 wires. And yes it's a 1993 del sol.

Yes but is your A/F gauge made for Zirconia type sensor? Also Mitchell1 was down for me so I wasn't able to get the schematic I will have to try again Monday I apologize for the delay.