It's a filter vacuum gage, and it says HG inches right on the gage, here's the link: http://cgi.ebay.com/WESTWOOD-F100-14-FILTER-VACUUM-GAUGE-REPL-GAR-BER-FRI-/380347732412?pt=LH_DefaultDomain_0&hash=item588e7dd1bc
Normally, the filter must be cleaned when it reaches 20-25 HG in. That's what the Donaldson Filter gauges specs call for, here's the link: http://www.donaldson.com/en/engine/support/datalibrary/053979.pdf
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Today's Featured Article - Farming Never Left My Blood - by Stan Gordon. I was born in 1947 youngest of ten of a working farm. Our farm was located in Saskatchewan near Saskatoon. We had a mixed farm consisting of grain and dairy all done with old machinery and by hand. My dad had a tractor, a Farmall A which was used mostly to run the thrashing machine, a seed drill and for plowing. I remember locals used to help each other and threshing was done from daylight to after dark, one farm to another until all farms were done.
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For sale Farmall super A tractor is complete and has just been setting for awhile,it was running when pulled out of the barn,shouldn’t take to much to get it going asking 1100.00
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