There have been a number of posts regarding the inaccuracies of liquid filled fuel pressure gauges. Apparently, unlike the non liquid pressure gauges, the liquid filled ones are very sensitive to atmospheric temperature and show inaccurate readings (like no pressure despite the engine running perfectly well). I've used both types of gauges and can attest to the problem. All that said, I noticed that Summit Racing advertises the Aeromotive fuel pressure gauge which is liquid filled, but includes a relief valve to ensure accuracy. These Aeromotive gauges are twice a costly ($47) as the usual ones from Summit or Earls, etc. Does anyone have any experience with these particular Aeromotive fuel pressure gauges as it relates to their accuracy. I don't mind spending the money if they are actually accurate under all driving conditions. Thank you.