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I've been having these same things with my '74.
When I unplugged my thermo sending unit and cleaned the connection and plugged it back in it was fixed. That takes care of one. My oil gauge never goes over half and is always at almost 0 when idling. I was told to get a Nissan oil sending unit. Mat take care of the second one. My fuel gauge never goes over 3/4 either. I'm going to do the first fix(clean the connections). It has seemed that with all the electrical problems that I have encountered with my Z I can clean electrical connections and it usually clears up the problem. Hope this helps. Happy Holidays

 

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My amp guage usually sits at about 14 + or - depending on idle. It seems to have a good alternator. Of course, I'm in the process of installing the stereo also. I'll post what it reads afterwards.