I have an mk1 gen 3 impact that came with shiit white gauge. They are off like at least 15 bar difference. Are the new fx black gauges as accurate as the wika gauge? And where can I buy the fx new gauge? Cause I like the black gauge to match the gun vs the wika gauges. Also how much is price for each gauge and does it come with the black cover or is that also separate? Cause indeed huma selling the black cover separately.