If Farmall H's or M's have the throttles and governors adjusted properly then the PTO shaft will spin at right around 594 rpm (call it 600 rpm for easy visual on most handheld gauges) at WOT with absolutely no load.
I actually use a handheld stewart warner type tach on the PTO shaft gauge to adjust my throttles to proper spec for both WOT as well as idle speed prior to doing timing sets etc. I have no way to use the handheld on the engine safely since no access, but it is real easy to use on the PTO as long as you know the target PTO rpms for each setting. Thanks to Pete23 and Owen A..land those have been mentinined in some of their posts and I have mentioned it some of my posts as well.
So the answer to your question is pull it wide open and you will be real close to the 540 rpm when there is some load on the PTO. (assuming your throttle is in proper factory adjustment). Only sure way to know is check it especially if you suspect some puller has oversped it in an effort for a couple more hp).
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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