Scangauge II with DIYMS?
 

I have a Brain built MS-I.

I kind of want one of these things:
http://www.thinkgeek.com/gadgets/car/8426/

But I'm worried that it won't work with the MS. It only needs OBDII to run, and forgive me, but I don't really know what the MS does to the stock computers.

Can anyone give some words of wisdom?

Where I have nothing to really input for this specific question, I do have a SGII and use it on my daily driver/fuel saver and I love it. I clear everyone's check engine lights and give them the codes and keep a generic OBDII Code list on my glovebox. Very helpful just for that.

I also monitor intake air temps, coolant temps, check for voltage problems w/ the voltage readout, and adjust my driving style by watching either LOD or TPS while commuting.

Very cool toy, very helpful and after 2 years I'd say it has paid for itself.

It replaces it and it doesn't output OBD codes as that would be illegal.

So no you can't use it.

Is it a parallel or standalone install? Parallel installations let a ScanGauge work normally, standalone installs would need a MS-specific display device.