"Can I fix these without taking the thing out?"
yep, definitely. Worst case scenario would be having to remove the valve body to get at the shift shaft seal, but it isn't too difficult. The speedo housing is really easy, just pull that one bolt, note the orientation of the speedo housing and pull it out-there is an o-ring (just like a distributor) on the housing. I would still do the shift shaft seal first, that is definitely leaking, then after that is fixed, see if anything else leaks.