Good morning guys!
Yes, that MAP under the ECM bracket is what our ECM uses to monitor the state of vacuum during secondary operation. The vacuum hose attached to it originates at the T-ee fitting at the left actuator. Also, now I'm not 100% sure on this but I'll post it as a "beware" kind of thing.
The MAP under the ECM I think is a different part number. Not sure, but I remember doing something and trying the electrical connector on my spare MAP sensor from behind the plenum, and it seemed not to want to plug into the MAP's socket???? This is a big "not sure about this" on my part. I think I was just doing a let's see if this works thing, and I couldn't get the plug in my spare plenum mounted MAP.....I was kind of surprised, but I have never revisited this issue to nail it down
I will this weekend if I have a chance, now that I'm thinking about it. I was doing my own diagnosis of a hard 61 about three years ago, and I brought all my spare parts with me to the garage I rent so as not to forget anything I might need. As usual, I was in a hurry to get the 61 cleared up as it was a week before my first Carlisle and I wanted to take the Z. My 61 was the ECM.
Tom