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(I edited my previous note but I'll put similar comments here)
I bet the splitter will work and won't work: It will work in that it will allow you to plug in two devices to the OBD2 port at a time, but, given the protocol, I don't think both devices will be able to run at the same time. According to OBD2 the devices have to request the parameters from the modules (in this case mostly the engine computer). I'm pretty sure the engine computer can only handle one device requesting at a time and thus with two devices (HUD, and Scangauge for instance) only one of them will get the data.
It is possible that they've change the spec since I've seen it and that the devices may be able to simply listen for the appropriate messages on the link (in which case they both would work at the same time), or that the devices may be able to pick up the messages destined for the other device (in which case they both may work--or not: When requesting parameters the devices can tell the engine computer how to pack up the data in the reply. It is very unlikely that both devices would pack up the data the same way).
I'll be interested in hearing from those of you who are picking up a splitter if you can get both the HUD & your other device reading the same parameters at the same time. (I say try it: It will either work or it won't--yeah how zen is that for you LOL).
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