How do I send items to a gregtech machine only if it is not running?

So I have an array of gregtech machines (induction furnaces at the moment, but I want to set up rotary macerators, singularity compressors, industrial centrifuges, centrifuge extractors, etc). Each array consists of 8 machines and I have 8 arrays per machine. I want to make sure that if all 8 machines are full then send it to the flow of items to the next array of 8.

I started this project with electric furnaces. That was very convenient because you could just use a gate set to "is running". But that can't be done with the induction furnace.

So I have two questions:

How do I get a redstone signal if a machine is running?
How do I make items go one way when redstone power is active and another way when redstone power is turned of?

Edit: I would prefer a solution with redstone but it does not have to be with it if it is possible in another way that would be ok to.