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Or, you could search the site for the part number.
http://www.steelsoldiers.com/showthread.php?113244-Civilian-wheel-cylinders-for-a-Goat&p=1425251&viewfull=1#post1425251
Bad gauge panel ground is more likely the issue.
It grounds with the 2 screw fasteners in the corners, to the dash.
Best option is to add a ground wire between the panel and the dash.
Simply wire brushing the holes & fasteners works too.
Also, the gauge to the panel needs cleaned.
Can you chuck a cordless drill onto the pin?
Maybe pull out while spinning it?
The other end may be bent or the spring may be so disintegrated(rusted) that it is keeping it from moving out.
First off, you need to run them through relays that energise them with the key on, or they would read(draw power) all the time.
Also, you need to connect each battery both + and - to each meter. As you described, you would read 12v(front battery) and 24 volts(both batteries) if you ground...
http://en.wikipedia.org/wiki/Winter_diesel_fuel
Just add the additive and replace your filter and see what you get.
You should have a spare filter in the truck(at all times).
And you need to use the white bottle(or some brand) of additive every time you fill up.
Personally, I do not see the need to make such a modification.
I watch my gauge, and if it is not where it should be I simply take out the DMM (that I keep behind the seat with spare GPs) and test the battery voltages.
I trust the alternator lights.