EGR vacuum line on Euro 500's, from throttle body switch OR other?

[Bondavi]

On a euro 500 (federalized for US), does the vacuum line to the EGR valve come from the throttle body inside the engine valley or does it piggy back on another vacuum line anywhere? If it piggybacks, I assume the EGR line is plugged.

In full euro trim, would the throttle body switch lead directly into the EGR? I've seen some cases where EGR piggybacked into the charcoal canister vacuum line coming off the top manifold.

My instinct is to stay with the throttle body switch, but if smog results would be better with a "temporary" shift elsewhere for the EGR vacuum line, I'd like to know.

Also one of the outlets on the throttle body vacuum switch states it leads to the "warm up reg - lower chamber", I assume to connect DIRECTLY to the lower chamber itself?

Thanks!