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I think I was confusing the passenger side ECUs where 1 is for the engine and 1 is for the trans. Maybe the two engine ECU are the same, but they are so far apart that it is unlikely you would mix them up. I do the plugs one side at a time, for example, and have never had the slightest concern about mixing them up.
If I was doing a bigger job where I had everything off the top of the motor and had to pile it up somewhere, I would mark them. Can’t hurt to mark them. I will be doing a big job soon — Supersprint turbo headers, but am hoping I won’t have to pull the ECU since I will be working in the center of the Vee rather than on top of the heads.
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