(see WP #6377) 

We are comparing gauge drift behavior when pumped by local turbo vs. when pumped by site vacuum volume. 

The attached shows how other gauges which share the common 24VDC pwr supply respond to changing electrical demands - in this case, PT120B responds to PT180 traversing through different pressure ranges.  We aren't interested in pursing eliminating this phenomenon at this time but, rather, want to document this for future reference.