Low coolant alarm. Which one?

[jff45]

Thanks John. The extra led. Do you think its necessary? Or is it just any old led you used?

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Mark, the extra LED (small red 12v from Jaycar) is required if you want a good visual indication in addition to the buzzer. The only other way to have a visual is to mount the Redarc box on the dash in front of you.
IMO, the LED is discreet and really catches your eye in case you play loud music, for example. I just prefer the belt & braces approach with something that important.
Of course, it's more work..