2 questions
 

First one. ...my boost pressure says 20 psi running and 14 with the engine off. Is this also the map sensor??

2nd has anyone tried to change 6th gear for a higher ratio for better mpgs??

Thanks. Jeremy

If you are reading thru the data port then yes that comes from the MAP sensor.

Probably can switch to the higher ration if you can get the correct parts. It is just 6th gear differneces. Will need counter shaft and main shaft gears both of they are removable.

G.V. Overdive? Kinda spendy but what isn't?