What connector is this for
 

This engine harness is for a 1989 GTU. I got it for my car, a 1990 GXL. They are both coupes.

The connector is a thin connector just after the little rubber firewall stopper. Looks like it only has 2 connection points, and looks like it has a red and black wire. The harness on my 1990 GXL does not have this connector. Any ideas?

https://cimg3.ibsrv.net/gimg/www.rx7...9d86a25f55.jpg