TH400 and modulator question

cool 84

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Joined
May 27, 2001
I have another broken 200-4r and I'm not willing to spend the money to fix it again. A friend of mine is currently building a 400 for me very cheap. My question is, am I stuck with a manual valvebody or is there some kind of vacuum modulator available that will work under boost.

I barely remember a contraption many years ago that adapted a TV cable to the modulator. Anyone know anything about this?

Sorry if this has been asked before but I did a search first and came up with nothing.
 
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