I have Precise Flight. I think a recent install bypasses most/all ADs.

Clearly a backup pump or electric AI provides more at a comparable cost.

Whatever you do, have an idiot light that tells you something failed.
Precise Flight provides that and it may be as useful as the actual
backup if you otherwise don't have a light.

ktbr wrote:
wrote:

Anyone have any experience with or comments about the manifold pressure
based standby vacuum system vs a separate electrical driven vacuum
pump? Other than the price difference. I want to install a backup and
am interested in getting some info.