i had a POS apc boost gauge in my car and it always read .5 bar and would spike to .6 bar which is about 9 pounds. the i got a autometer phantom and its reading 9 pounds and spiking to 11 pounds. then when i datalog it never reads past the 9 pound column. whcich is more accurate the stock map or the autometer?

 

I bet two of the same autometers would be different too. I had the same problem, and I still couldn't tell you which one to use. lol

 

The stock map sensor, depending on year will max out at 9-10~ psi and the newer ones will read to almost 12 (11.5-11.7~)

 

so it might be maxing out right now and only reading a certain pressure?

 

exactly.