How do you wire the a/f gauge on a OBD2 f body? Not sure what wire to splice into.

Also, do 4l60e have a temp sending unit? I have a temp gauge, but I don't know if i need to buy a sendind unit or not.

 

The data comes from the purple wire on the O2.

 

As far as the tranny temp gauge goes you should have received a nice shiny thermistor which screws into the tranny. Look on the driver's side of the tranny about half way down above the pan...you will see a little plug there not doing anything. Unscrew the plug and screw in the one that came with the gauge. Now just run a wire to the gauge from the thermistor.