Ok... where do I hook up the temp gauge wire coming off teh EJ22 harness?

To the signal wire going to the EA gauge.

I'd like to know on what plug on teh back of teh dash, or somewhere under the dash.

 

The engine harness plugs have already been encapsulated in in the fender well, and I really don't want to remove my fender again.

What I did was take the water pipe and modify it. I took the ej22 2 prong connector one out of its hole, and the gauge one out of its and then I drilled and tapped the smaller (gauge) hole out to accept the 2 prong computer signal one and drilled and tapped the bigger one out to accept the ea gauge sender and ran the original wires for the gauge.

 

On my 84 turbo 2.2 conversionI kept the sender as they relocated it on the turbo recall program to be in the heater hose inline.