1977 280z transmission sensors leak oil

Greeting

my 5 speed manual transmission has 3 sensors.  They all leaked at the sensors’ electrical pins and plastic housing.  I’ve replaced the reverse sensor to fix the annoying oil leak.  Question is that the other 2 sensors don’t seem to do anything nor any electrical connect to it.  These 2 sensors located toward the drive shaft.

  What would you do? Can I just put bolts to that 2 sensors to stop the leak? Any advert side affect to it?

much appreciated 

regards