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For the FL of the C14 you'll need a modern (sensitive chip) guide camera for those times there are now bright stars visible in the subset of your main scope FOV the OAG prism can see.
As people have said, if your FOV is large enough that a larger prism doesn't intrude into lightpath then that improves your chances.
Rotation of the prisim is an option on some OAGs (but its manual).
If you're lucky enough to have a rotator than you have another chance at getting a FOV with a guidestar.
I've never been able to match guiding performance with guidescope versus OAG, but they can take quite a while to get right in the first instance. You shouldn't need to fiddle after that one off set up however.
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