While reading my haynes manual on the 740 turbo I have, it is important to obseerve the guage while the engine is cranking. Needle fluctuations presented give indications of internal wear or damged which a mere look at the top compression reading do not tell.

for example, if the needle does not "come up" on the first engine revolution or two, suspect a ring problem.

And don't fail to check CARFAX on the history of this milage.