either one is fine - just make sure it is mounted to some aluminum to
provide a heatskink. The 78XX is cheap - around ten cents the last time I
bought a bunch, the LM350 costs a little more - and a fixed regulator is a
lot easier for someone to use who doesn't do a lot of electronics - it has
an input terminal, and an output terminal, and a ground terminal, nothing to
mess up. They do come in various voltages, but 5V is very common/cheap/easy
to get, and will be fine for a 6V car to run gauges. You may wish to
measure current drawn by the gauges though - I think 1 amp should be enough.
And, the regulators are so cheap you could put one on fuel gauge and another
on the temp gauge if it is electric and not mechanical.


"cavalamb himself" wrote in message
...
William Noble wrote:
consider a 7805 regulator

this will give you nice stable 5VDC at up to 3 amps


The 78xx series are only up to one amp depending on packaging.
http://www.fairchildsemi.com/pf/LM/LM7805.html

Try LM350 adjustable regulator - Guaranteed 3 amps.
http://www.national.com/mpf/LM/LM350.html (with sechematic)

Richard



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