Hi,
The best and easiest way is to create a DLL with your Pascal code. Then you will be able to call your DLL functions from LabVIEW.
You will find more informations on the following links :
http://zone.ni.com/devzone/conceptd.nsf/webmain/5CF9A9FFD774028586256869005FF2ED
http://zone.ni.com/devzone/conceptd.nsf/webmain/B26A875ACA51C567862567CA0055FF24
Regards,
Benjamin CHARLES
Applications Engineer
National Instruments France