I need to test my temp gauge out of the car.
Is it OK to use a traditional style battery charger for the 12 volt feed?
I checked it with a voltmeter and it looked like about 13.5 volt output.
Will it damage the gauge somehow?
Battery chargers can provide pretty lumpy power - and I thinkg the vwoltage can be a little higher than it ought to be.
In short: I won't recommend it, but it will probably work fine.
Uh - you should be careful of having a battery charger hooked up to a car with FI while uyou are trying to start or run it - the power drain can cause some wierd power spikes which can (did) kill the FI computer (happened to my megasquirt).
For a guage it will most likely be okay. I usually use a PC power supply for testing guages and FI stuff though.
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