norm2 wrote:

This site( http://64.27.84.239/ ) has a 4x20 backlit module that accepts
power, ground, and serial data as inputs.  $99.  

This is a high  price for a 4 by 20. DigiKey has them for near half that price.
http://www.digikey.com

I have built and programmed
a similar display that took information from a serial line, and based upon
the information in the serial stream, it would display the information.  It
looks to me like a person needs a module in the engine compartment that
gathers the additional info that people want, and transmitts it on a serial
line to the display unit up front.  This would be the high priced spread.
The second option is to hook the off the shelf $100 unit to a serial line
that outputs the info directly to it.  That way you don't spend any effort
developing another electronic module.

My plans are to have a couple pressure sensors (oil, water, fuel pressure),
a couple temperature sensors (oil, water, maybe a couple other places),
perhaps a cylinder head, some fuel level sensors, rpm sensors (lifted from
an existing signal).  I think that trying to create a one size fits all
system will quickly price itself out of the range of some people, limit the
market, and thus drive up the price.

 
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