On my 77 N/A car there is a metal can on top of the IP. Looks like mabe a govenor, or advance?
Is this to be hooked up to vacuum? if so where? and constant vacuum, Like from VP, or changing from where?

I will get a photo later if needed. Car is at home, I am at work.

thanks

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83 300SD Dark Silver Dark brown inside

dome shaped thingy does not connect to anything it stays open like that.
I asked the same question with picture and that was the answer.

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2010 ML350 Bluetec
2012 Mustang Convertible

That's the "ADA".

It senses atmospheric pressure and reduces fuel in the IP as the pressure is reduced (when the vehicle climbs in altitude). The engine would smoke rather badly at 5000 feet without such a device.

That adds up now.
thanks

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83 300SD Dark Silver Dark brown inside