^ Yes will kill your head pressure.
Good article though, not sure why Lee's pump ran 0.5 psi below spec's, likely do to 12V vs 12.5V.
Still odd, since we read 0.4 psi over 750 at 12V .
Maybe his pump is getting warm, since it does not have thermal conductive potting compound.
We left it out so he could see "what" was inside.
Regular pumps look like this inside
www.c-systems.ca/images/encaped.jpg
Most systems run 12.5 to 13.5V, so unlike the 750, we designed for this voltage range.
Dave