I made my first dairy free pumpkin pie the other day, and it was FABULOUS!!! I only made TWO changes to the recipe on the back of the pumpkin can:
I substituted the amount of evaporated milk with an equal volume of canned coconut milk (the kind with the solids in it that's thicker than the one meant for drinking that comes in a carton). Then I added about 3 Tbsp flour to the pie (not called for in the original recipe).
I made a pie first with only the coconut milk substitution, but it was a tad soft set (softer than a regular pumpkin pie), so the 2nd pie I made I used the flour and it worked fabulously!