[TR] TR7 question

[Tom Walling]

I'm an "old hand" with the earlier TRs, having owned a TR3 and a TR6 for many years, but I now find myself in new territory with a 1979 TR7 in my garage.
 
First question (of many to come) for the list: There is a vacuum motor attached to a heat sensor to open and close a flap in the air intake to prevent carburetor icing I think. I can see that the sensor connects to the vacuum motor with a rubber hose, but where does the vacuum come from? The sensor has 2 nipples, and it probably doesn't matter which is connected to the source or the motor, but what is the source of the vacuum? It must be either the intake manifold or one of the carburetors, but where?
 
Interestingly, the Rimmer Bros. catalog shows a short piece of tubing that they think connects the 2 sensor nipples! And of course they don't stock it anyway.
 
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