MAP sensor vacuum pipe

[Cobrac]

Hi all,
Hope you can help, I am helping someone with a 1.2 1994 8v corsa B, they have had the HG recently done, since then no water lost, but runs like a bag of nails until temp is reached.

Looking around, I have found that there is a pipe missing! There should be a pipe on the MAP (located top of bulkhead) now, I will get some vacuum pipe tomorrow, but where does it go? I'm guessing manifold as thats what the M part of MAP stands for, but can someone tell me exactly where please?

Also, if anyone has any pics of the pipework on their 1.2 it would be greatly appreciated.

TIA

[Cobrac]

Any ideas guys before I go there to look at it tonight?

I'm guessing it should fit on the rear of the throttle body somewhere? or maybe inlet manifold?

Cheers