I guess I should read all the posts first.

Hello Rusty.

I might be too late in posting but you should check out CTC products.
They have monitoring/protection system in their PRO line up that might meet your needs
www.ctconline.com

If all you want is a simple cut out if the vibration gets too high, why not utilise vibration switches and link them to the DCS?
Try this link for example:
http://www.fwmurphy.co.uk/products/vib_time_speed/vibration_switch_20ss.htm
These are used extensively in many onshore and offshore installations where a shutdown is required if the level of vibration exceeds a specified amplitude.