Murphy does have a good cousin.
He invented a mechanical gauge with electrical contacts built into it. In
effect a gauge and adjustable alarm switch together.
I use one for main engine temp and another for main engine oil pressure. They
work great.
http://pjpower.com/murphygauges/
Norm
S/V Bandersnatch
Lying Julington Creek
30 07.695N 081 38.484W
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