How to straight Speedometer cluster in 1972 Dodge Demon?

Am I able to adjust to straighten up the speedo?

You should be able to, there are two screws on the back of the speedo. Loosen them a bit and see of you can adjust it easily. There are three cardboard rings that isolate the turn indicators and brake indicator that might give you a little trouble. Just be gentle and it shouldnt be too bad.