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That vacuum regulator should be bolted down, two 3/8" (I think) short bolts. You'll need to set up (towards or away from the firewall)), before you tighten everything down.
Do yourself a HUGE favor and insulate those terminals on that relay, ASAP. There is some decent current flowing to that relay and you don't want to inadvertently find out how much of a STING it can give you (please don't ask how I know !!).