Depends on if you are using two sets of shift points in the PCM. If you are only going to use performance, you can ground it. You could also wire a switch anywhere that you could toggle to get the same grounding of the PCM. I've had a few different shifters around...
My 87 GT Poly Suspension Upgrade (all pics) thread
Removing the roof panel
My HUD install thread
Isn't it strange that after a bombing, everyone blames the bomber, his upbringing, his environment, his culture, his mental state but … after a shooting, the problem is the gun?