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The RPM pickup is probably set for the wrong number of cylinders thus you get a higher RPM reading. Since HP is basically TQ x RPM, you're also getting a higher HP reading than you should.
^ This.
Originally Posted by phreaktor
The owner is staying late to do it for me again. Will update...
Why did you even go back? I would've just gotten my refund.
I don't like tolerating stupidity, disregard for others' property, laziness, etc but maybe that's just me.