This shows a detailed picture of a 1989-1995 wire loom. Actually taken from a 1992 GTS loom.

It shows the two ecu connectors (LH and EZK) and the socket for the coding plug.

next is a close-up of the connection at the CEB panel (Yellow and Green connector),

the connection to the ignition Amplifiers at the front bumper (2-pin White and Green wire),

the IMR relay socket (white connector),

and the connector for the CO potentiometer, which is there for early models without lambda (black connector)

And in this close-up again the a.m. connectors but you also see the round cable with the round lambda sensor connector.