Can my TS1 tank sender be reprogrammed?

Yes, using a TS1 programming kit (TS1-PK)  and downloading the BEP software from the BEP Site here the TS1 can be programmed to different tank configurations.

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Why is my TS1 tank reading empty when full and full when empty?

This can happen when your sender is not set up for the correct gauge. You will need to connect the sender to the TS1-PK and reprogram the sender output(e.g. 10-180 ohm setting will make a Teleflex or Faria gauge read opposite. 240-33 ohm will make a VDO gauge read opposite).