I just found this on an Aussie blow off site. Unfortunately they didnt have any blow offs big enough for our trucks however i did find this cool little gadget. Seems to me someone on this board built one of these himself. This here could make for a very nice addition.
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IN CABIN
Designed to be mounted inside the cabin and allows for boost adjustment on the run. Ideal for the active enthusiast.
Control boost from the drivers seat
Detent System for ease of adjustment
Gated System to bring boost on faster
Mounting bracket, hose and all fitting hardware supplied
http://www.turbosmart.com.au/

IN CABIN
Designed to be mounted inside the cabin and allows for boost adjustment on the run. Ideal for the active enthusiast.
Control boost from the drivers seat
Detent System for ease of adjustment
Gated System to bring boost on faster
Mounting bracket, hose and all fitting hardware supplied
http://www.turbosmart.com.au/