fuel cut defender turbo xs

Hi ppl, i installed a FCD from turboxs on my 89 toyo supra turbo and it seems like it works ok , but it doesnt stop the computer from hitting fuel cut.? i am tapped into the orange wire of the (asst sensor turbo pressure +5v) even if i unplug the vac line to this sensor i still hit overboost fuel cut.? how can this be happenning? am i in the wrong sensor? like i say its on drivers fender labeled asst sensor turbo pressure. like assistant? like maybe there is a primary one that i am not seeing? the only other thing i can think of is my stock boost guage is still connected and pegs at 8psi even know my aftermarket one says i hit fuel cut at 14 psi? any one ever run into this ? any ideas please would be very welcome..