Best Way

What is the best way to put stuff in certian slots of an inventory.

Trying to automate adding fuel and cooling cells in a reactor and i want it to keep my order of what they're in, Tried openccensor but when the slot becomes empty, it returns nil making it hard to detect when it needs fuel. Openperphial dosen't seem to work as it should.

I want to put certian items in certian slots, when the fuel runs out, it will be pulled out and the "program" will put another one in the slot that has became empty

I need to do the same with cooling cells but the reactor needs to be powered off when it removes cells, i couldn't think of a way to turn the reactor off when cells got removed.

Can't say I know that much about reactors, but in regards to your mods, I'd recommend inspecting your version numbers.

As far as i know i've got all the latest versions

That's not helpful. Why don't you state what versions you do have so that we can help ensure that they are, in fact, the latest versions.

OpenCCSensors-1.6.4.1b
OpenBlocks-1.2.4
OpenModsLib-0.1
OpenPeripheralAddons-0.1
OpenPeripheralCore-0.3.0
ComputerCraft1.58

Need any other mods? Better yet here is a pic of my mod directory

OpenPeripheral pullItemIntoSlot and pushItemIntoSlot, dosen't put it in the slot you tell it to

[attachment=1449:mods.PNG]

Not asking anyone to code anything, i just wanna know what is the best way to do this, i can handle the coding on my own with trial and error