that is a sharp looking mounting job. very nice.
what is your vacuum at idle after fixing the kink in the vac line? on an engine in good condition, it should be 18-21".
here's a great reference on how to use a vacuum gauge to diagnose a variety of engine issues. scroll down to the bottom for a great little graphic.
How to Use and Interpret a Vacuum Gauge
by t-ing into the vac line for the brake booster, do you find applying the brakes has much effect on the readings? for future reference, you can splice into any vac hose coming off the intake plenum but i prefer not to use the hoses associated with the brake booster, fuel return diaphragm, or PCV systems. that leaves hoses going to stuff like sensors, EGR, etc. alternatively and ideally, some engines have unused ports on the intake plenum or manifold that are capped at the factory. pull the plastic or rubber cap off and attach the hose to that port.
i've been driving with a vac gauge for a few months now and have managed to increase my mileage by an average of 10% so i'm a big believer in them.