Im not sure where it is located on OBD0 setups. But your 2 choices are to get a used one off a old car and wire it in. or have someone disable the sensor on the chip. Like I said. since we live in a area where there is no large increases or decrease in altitude. not running one will have nmo affect on your running car. I disable the PA(Baro) sensor on almost every car I tune, unless they plan on going mountain driving, and even then the affects are little to none

BTW. I do all OBD-0 ECU chipping and tuning