Steel Pipe Bomb ??

I decided I wanted to keep my TPMS inside a 3" galvanized sched. 40 nipple and 2 caps. This was available instead of PVC like most folks use.
I drilled a hole the proper size in one of the caps then used one sensor as the filling schrader to put the air in.
I have not been able to get the computer to accept this.
Followed the reset procedure in the manual and tried different pressures from 32 to 35 and up to 45 PSI.
Is it possible the all steel container is stopping the signal from getting out and to the computer.

Anyone do this or some other all steel container?
I can get PVC if I have to, just wondering if anyone has tried it like me or am I screwing up somewhere else?

 

The metal pipe is blocking the signals from the TPMS sensors that are inside
the pipe, the sensor that you used for a fill valve is the only one
that the TPMS system is getting a signal from.

 

That is what I am affraid of, I may have outsmarted myself again.

Anyone have this happen with a all steel setup?