Hey Old dog
yep you will need 4 point harness, pretty easy to add and think about a antisub belt too...just in case, it's important to be safe while having fun.
You'll aslo need a Roll bar or cage, Snell 2000 or newer brain bucket, full length cotton pants, socks, full shoes, no flip flops
cotton T shirts were alllowed last year, because it was hot . but long sleeve would be better
anything else , let me know
Hope to see you there