You can get support from the suppliers. They will need to know the pump size, speed and type of bearings, etc. Proximity sensors may be suitable for pumps with lubricated bearings. Other likely products include velocity sensors, and mechanical switches. Consider companies like Metrix Instrument Company, Bently-Nevada and Rockwell Entek IRD for vibration instrumentation.
Try to contact bently nevada company> On plant Im working all pump, compressors and turbines running with this company mane vibration monitors. Quite good quality. I attached the link. this company belongs to GE.