I have a clausing model 5914 with a taper attachment. I am not clear
how to set it up. The first thing I need to know is how do I hold the
tapper bar in place as the tool post moves along the way. Any
additional help you can provide will be greatly appreciated. Thank
you.

I'd suggest you get the manual if someone with this exact machine doesn't
chime in.. Available he http://www.machinemanuals.net/index.php

Taper attachments all work about the same, you release a bolt holding the
cross slide in place on the carriage. Then tighten a bolt holding the cross
slide to the taper attachment. Last there will be a clamp that holds the
taper attachment from moving up/down the ways.

I use the taper attachment 1/year and I have to pull the manual down every
time. I've got CRS (can't remember ...)

Karl