Since there is no true 1:1 gear in the auto how do I calculate rwhp? I know the pull is done in 4th but it's 1:1.14 I believe.

 

The dyno people should know how to do that, and they should be doing the calculations and providing a chart with RWHP and RWTQ. If they don't know how to do it, go to a different dyno shop that knows what they are doing.