As you probably know, most efi systems use a MAP sensor which basically
does just that, measures load based on manifold vacuum. If all you want
to do is switch on a switch, it would be fairly rudimentary electronics
in conjunction with a relay to do this.
See link below for one of may sources of map sensors.
>currently looking for a vacuum actuated switch that will switch on the
>the engine is under load (anyone have any suggestions? I would like to
>switch or take signal off of the intake manifold, so it will switch on
>vacuum decreases instead of increases, as I do not have a vacuum port on
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