I'll just mention that a crows foot changes the torque reading. Google it for many sites that explain how to correct for it.

It may be easier to simply use a fish scale and pull perpendicularly on a pedal wrench to torque the pedals. Torque is length between the pedal spindle and where the scale pulls multiplied by the force. (to convert kg to N, multiply by 9.8) 1kg=9.8N