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I've actually wanted the same thing for years - so I built one. The first version used a PIC16F877A microcontroller and serial LCD module from sparkfun.com, as well as a handful of temperature sensors (DS18B20) and a pressure sender meant for a prosport gauge. I designed a DIN slot adaptor in solidworks that would hold the gauge as well. Never ended up installing it though, got distracted rewriting all the code for a 32 bit microcontroller. I still have the 8-bit code if you're interested.
Chris
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