visa works with highlight execution

I'm trying to modify the example provided by Omega to read from a PX409 pressure transducer.  The code used to verify that the sensor is present only works when I run the vi in highlight execution mode so I know that means I need to initiate a wait of some sort somewhere along the visa communication trail.  I've tried all sorts of things with no luck.  I've attached the example vi from Omega.  Can anyone point me in the right direction?

Thanks.