Two Years have passed since Autometer's engineering and support group told me it was impossible that their fuel pressure sensors for there digital
gauge cannot be faulty.
Basically telling their customers that after spending around $300 for their product and screw warranty for functioning incorrectly that there is no recourse
in getting their product that works as their marketing claims

This August 2019 I decided to give it one more shot in calling Autometer and again explaining how their fuel pressure sensor degrades over normal or even
less engine bay temp and was again told their products design or quality do not degrade with less then 125 degree engine bay temperature
I spent around 1 hour on hold to even get to talk to anyone there.

Autometer's 0-100 PSI spec'd to function from 0.5 to 4.5 volts alone costs $120-130, that does not include anything else.
I searched internet and found two other brand sensors with the same specs as Autometers

Considering the hood on my Corvette has multi opening to bring in colder air and extract hot air and has a larger flowing radiator with a 185 deg Tstat and
a heat exchanger with 7 quarts of synthetic oil the engine bay is cooler then a normal car yet Autometer sensor still degraded the output to their own gauge

One cost only $18 and the other $22, seems one hell of a profit margin for Autometer

I tested both mounted 16 inches from engine which is cooler then top of engine where last I located Autometers which still degraded and incorrectly reported
out of spec fuel rail pressure
Neither of the two tested failed, even in 90 degree summer weather and even worse case with hood closed and engine at idle for 20 minutes

Then mounted these 2 other brand sensors directly to the fuel rail as shown below and again hard heat tested to where sensors shell reported 140-150 degrees
and at worst dropped 1 PSI where Autometer's reported as low as 54 PSI.

I took apart one of the 2 Autometer sensors, the shell (case) is only 1 mm thick so it cannot heat-sink very well and once heat-soaked the incorrect output values
(voltage levels) maintain and rest of that drive cycle reports PSI incorrectly
Once engine and bay are cooled down ( lower then 100 degrees) then their sensor again reports values correctly so
that shows the flaw is within their sensor ( or who they OEM them from?)

Being all these tests used Autometer's digital gauge and their wiring shows the design failure due to normal and even lower engine bay temps is directly
due to the design or lack of quality control of their $120 plus sensor

You would have thought their people would have wanted to use my testing to solve and better their product but instead they insisted their designs never fail