Been collecting TBI parts here and there and came across [most] of a system in a 1990 GMC 2500 pickup today- I got what I didn't have already- but there was a part I hadn't seen before connected to the wiring harness. It looks like a shrunken ECM- encased in plastic but attached to brackets on the outer side of the master cylinder. It had two electrical connectors of -give or take- 6 wires each. Any idea what this thing is? I've never seen anything on it in manuals or on the web that I've looked at.