Beginner Bracket Equipment Advice

After many years and thousands of dollars I think I have a half way decent car to start bracket racing with. My main question is in regards to equipment; specifically a weather station. Did the information that it supplied you help you choose a good dial-in, or do you run more seat of the pants?

I guess the main idea is, are the racing weather devices worth the investment of $200+, or would that money be better allocated to more fuel, entry fees, and parts. I've been running the car at test and tunes for that last few years to get a feel for it, when my schedule allowed, so I have seat time in it. Thanks for the advice!

For the digits on the car its best is 11.6 @ 115. It's a 74 Dart Sport with a 383.