The voltage dropped across a resistor is inversely proportional to the current flowing through it, and, most likely, the hourmeter doesn't draw much current so little voltage would be dropped across the resistor and the hourmeter would get near 12 Volt battery voltage (actually more like 14.5 Volts).
With today's electronics, there's all sorts of options to do it with regulated electronics.
If you GOOGLE "12VDC to 6VDC converter" you will find all sorts of circuits to build your own, or you can buy a ready-made starting at 10 bucks.
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Today's Featured Article - Talk of the Town: Miracle Formula for a Stuck Engine - by Edited by Kim Pratt. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: I have a stuck 4 cylinder engine. Two pistons right at the top, other two down. From underneath everything looks good. Up top looks bad. Thanks in advance."
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