99 wont work with the 00+ instrument cluster/shifter display.
You will find that it will run but a lot of the data bus features will not...things like communication to the BCM and instrument cluster module....hence osid numbers
This was for a swap in my fiero, just used the motor/trans and PCM.
86 Fiero se convertible 3800sc 4t65e HD(2002), Gen V, 3.3 pulley, SD headers