boost problem

my vac in my area is -20 at idle. when i go up into the mountains (8000 ft above sea level), my vac is -16 to -18. when i go to the beach, it is -22 at idle. so i think elevation has something to do with it. but generally, it should be around -20.
 
Ok i finally got around to getting another gauge to try and it fixed my problem its not bouncing around anymore it just holds steady boost
 
that's good to hear, it sounded like that was the problem since the car didn't feel like it was bouncing between two boost levels.
 
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