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If by adjustment for the HV you mean the Horiz oscillator adjustment procedure, the scope is needed to adjust the wave shape of the osc. There are two slugs in the osc coil one is primarily for the shape and the other is primarily for the frequency, BUT they interact with each other.
With RCAs (when adjusting the H osc) I tend to scope video and set the scope up to show 2 to 4 H synch pulses and count the scope scale divisions between the leading edges of the tips. Leave the scope time scale untouched and connect it to the horizontal. I then adjust the horiz oscillator coil slugs to get the peaks of the waveform the same distance (read divisions on the scope screen scale) apart as the video sync peaks were while maintaining proper wave shape illustrated in the sam's...It is not hard to do once you've done it once or twice.
There may be other controls like Drive, linearity and width that need to be tweaked for best/correct operation.
IIRC the yoke plug on that is octal. You can extend the yoke by robbing an octal socket from a junk set, taking the base off a dud octal tube and some wire and making an octal extension cord...You can do the same with the HV lead (you'll need a big screen BPC CRT set to rob the HV cable from), and the CRT socket (brighteners will give you all you need except the wire).
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