i have a 92 turbo that hits fuel cut at about 11PSI ( it used to be at around 14.5-15). I currently have a truboost controller. I have verified this with another boost guage. I have also checked the turbo pressure sensor and it checks ok according to the manual. If i unplug the sensor it hits the fuel cut the same. So i think it is acting as if the boost signal is not getting through to whatever component controls the fuel cut. Does anyone know excatly how the computer gets the boost signal, if it does? according to the official toyota wiring manual the boost sensor does not feed to the computer.