[William.c.Jones]

So if I read your post correctly then we have it right and the pressure switch goes between the Spike relay and the Compressor. does that mean the manual is wrong where it says " Do not put the pressure
switch in series with the power supply to the compressor.""It must be wired directly to a digital input and ground port on the Digital Sidecar."
The way we have it seems to work although the lab view code is set up to read the pressure switch from the side car. I'm just worried about inspection I don't want to rewire this later.