IR Telemetrics, Inc. - Wrist Pin Sensor
It seems reasoanble to assume that pins that deflect too much will significantly affect the clearance between the pin and the piston and generate high levels of stress
It seems quite difficult to model the behaviour of the pin/rod/piston interface using numerical methods and I have seen FEA solutions that predict maximum defletion at the free ends of the pin and other solutions that show maximum delection in the centre of the pin.
May be the telemetry system may help.