>I'm confused. I thought that all the boost gauges are purely mechanical. >Is this not true? Is it possible to have the VDO gauge calibrated? Nope the 5KCSTQ's have a DIGITAL dash gauge that get's it's signal from the pressure transducer in the ECU, and mine reads WAY OFF........ Later! Eric Fletcher '87 5KCSTQIA2RSR2B STEADI RIC@aol.com