Making progress...
I have an Arduino Mega 2560 board and 2 x 40 LCD and the code ready to take in the data from 3 analogue sensors and the voltage,
I am waiting for some temperature senders (sic) to set up the A>D conversion for those via some ebay sourced voltage converters.
I am also considering the VSS technology described in the reply above to translate speedo cable rotation (measured using an opto-sensor) to a pulse to trigger a BMW motorbike speedo (electronic and £20 in ebay if you look)
I have added some poor quality video of the progress on my YouTube channel search: "Arduino Mega 2560 johnbullas" on youtube
The code enables upper and lower limits to be set and for Lo or Hi alerts to be flashed!
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