Are you referring to the hyd pressure, or the pedal pressure?
The fuel rail pressure sensor on Duramax diesel engines will read 0 to 30,000 psi.
And they make gauges that read it directly without using the ECM data, or if you have a datalogger that take external sensor output, you can read it that way. Like ISSOPRO, etc.
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2002 Z06 "Blue Meanie" 11.36 ET
2003 Z06 in progress
2009 CTS-V "Spooky" 12.36 ET, bone stock at 1600 mi. Rainy day in Sacramento. Sadness.
2010 ZR1 "Satan" no times yet.
2013 Volt SCCA Solo2 #771 HS3.
And a bunch of Duramaxes.
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