I would recommend to update OpenPeripherals to a newer version because the current included version Open Peripheral v0.2.1-preview8 has only minimal support for the most new 1.6x compatible mods as also described by the mod owner here.
I have tested the current dev builds:
OpenModsLib-0.1-snapshot-108
OpenPeripheralCore-0.3.0-snapshot-36.jar
OpenPeripheralAddons-0.1.0-snapshot-38.jar
They are looking good for now.
Important to know is that many commands have been changed in the new version. Very helpful is the doc program under "openp/docs" in-game.
What I have tested:
Tanks
Chests
Energy Cells