parrothead, Your P4450 sounds like it has some nice improvements. Your M&W dyno is an oil pump hooked to your tractor's pto. The brake handwheel is a precision valve that allows you to restrict the output of the oil pump and read out the restriction in HP. They are a remarkably rugged, stable, and repeatable instrument if they are used and maintained as directed in the manual. Same oil as listed, etc. I am sure you will enjoy using it for years to come.
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