Brake car pt 8

A leak....

 I have the brake system up and running again.  But there are two problems.  1) one of the two extra sound cards is not making noise.  2) there is a leak at the joint of the tank to the pressure switch.

 How should I fix it?  There is a nut on inside.  The tank is sealed, it will have 60 PSI how do I seal this leak?  I finally decided to use epoxy, and reverse the pump to suck the epoxy into the crack.  Tomorrow after the epoxy dries I will see if it works.

If not I will maybe replace the tank.