What boost gauge?

Just wondering what boost gauges people have? I should have sdi injectors, decat, egr blanking kit and panel filter coming but I will need to turn the boost up. Not bothered about having this mounted in the car but I have heard I can turn the boost up using a multimeter but no idea how to do this?



Any info/guides about the above would be helpful.



Also, will fitting poly bushes improve the handling significantly?

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