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VDO style combo gauge questions

Hi,

 I have a newly purchased used Fiberfab widebody speedster. It has VDO tach speedo and combo fuel and oil temp gauge. The oil temp gauge doesn't work at all. It has a sending unit that is tee'd off the oil pressure sender on the left front of the VW engine. Is there anything to look at  first to reasons why the gauge doesn't move at all? Thought I would ask here first before I started replacing the sending unit. My fuel gauge is wonky also. When the tank is full the needle is just a tick above reserve. Thanks in advance.

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