Richard:
I found two Henri Gamache in Napierville County, the first is a possible but the second does not seem to fit.

Source: BMS du Comté Napierville 1823-1983. Henri Simeon baptized 28 Apr 1884. Father: Isaïe, mother: Marie Comeau.
No other information.

Source: Napierville Co Marriages. Henri Gamache, father: David, mother: Vitaline Bélanger, married Azilda Fortin 13 Feb 1900.
Henri vf Azilda Fortin married Josephine Fortin 3 May 1904.
No other information.

Hope that this helps a little.