Dengler Family Genealogy Forum
I don't have any specifics on the Jacob you are looking for, but he must be descended from Jacob Dengler (1731-1785) and Catherina Koehler (1734-1808) of Montgomery County. I'm descended through their son George (1758-1811). I haven't found any other Denglers in Montgomery Co. at that time. The LDS site has some of this family (search under Jacob Teangler) and they were members of the Falckner Swamp Church in Montgomery Co.