Porsche steering racks

I did a search and didn't find anything in the forums pertaining to Porsche racks. Does anyone know about these racks? Apparently the 912, 914, and 911's thru the 80's used the same rack? I have no idea what the ratio of the rack itself is - deg/in of rack travel or vice-versa. So much information out there gives steering wheel to road wheel ratios, but that is useless since i am not using Porsche suspension pieces. Anyone have this info?
 
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