I am updating my 1.11.2 mod into 1.12 and I have used various Forge Forums threads and other websites to figure out how to port the code. I have found nothing on doing TESRs in 1.12 though and it is saying that my method signature isn't an override:

public void renderTileEntityAt(TileEntitySuppressionPedestal te, double x, double y, double z, float partialTicks, int destroyStage)

 

The method is now called render. It takes a new float argument, named alpha.