A/F gauge install ?

[bigboost7m]

I am about to install an Autometer A/F ratio gauge on my 7m and was wondering what wire should I splice into? The instructions say the signal wire but out of the two black and one blue wire, which is it?

 

[CarlosPTR210]

I install my AF meter the last Sunday, is very easy, I pass the purple wire through firewall to the engine bay.

Then I weld the AF wire to the ox wire (brown color in my supra’88, and is in the middle of the socket) in the diagnostic connector.

And that’s it :naughty: .

I will tell to you the same recommendation of other supra owner, this gauges looks good but is not trustworthy, but we really need a wide band kit meter.