gauge upgrades

so i have already installed the flex pod and the AEM A/F gauge and i was looking to get a boost gauge for the other mount. i see that there is a 35psi and 50psi boost gauge, the thing is i don't know the difference between the two and witch one i should go with. or is there another gauge that i should use instead of the boost gauge?

 

Won't the difference be in how much of a wide reading do want to have? up to 35 PSI or 50 PSI?

 

If you have the uego aem afr and you want the boost gauge to match; the 35 psi is the lowest aem gauge they make... I bet your close to 11-12 boost on a cold day with the 2.55... I have these gauges; they are great