1: Got everything working!

depends.txt

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+mesecons

init.lua

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+-- TIC-TAC-TOE BOARD MOD
+-- by whiskers75
+
+minetest.register_node ("tictactoe:x_on", {
+    drawtype = signlike,
+    description = "TicTacToe X",
+    tile_images = {"tttx.png"},
+    inventory_image = {"tttx.png"},
+    sunlight_propagates = true,
+    paramtype = 'light',
+    walkable = true,
+    groups = {dig_immediate=2},
+    material = minetest.digprop_constanttime(1.0),
+   })
+
+minetest.register_node ("tictactoe:o_on", {
+    drawtype = signlike,
+    description = "TicTacToe O",
+    tile_images = {"ttto.png"},
+    inventory_image = {"ttto.png"},
+    sunlight_propagates = true,
+    paramtype = 'light',
+    walkable = true,
+    groups = {dig_immediate=2},
+    material = minetest.digprop_constanttime(1.0),
+   })
+
+mesecon:add_receptor_node("tictactoe:x_on")
+mesecon:add_receptor_node("tictactoe:o_on")
+
+minetest.register_on_dignode(
+	function(pos, oldnode, digger)
+		if oldnode.name == "tictactoe:x_on" then
+			mesecon:receptor_off(pos)
+		end
+	end
+)
+minetest.register_on_dignode(
+	function(pos, oldnode, digger)
+		if oldnode.name == "tictactoe:o_on" then
+			mesecon:receptor_off(pos)
+		end
+	end
+)
+
+minetest.register_on_punchnode(function(pos, node, puncher)
+	if node.name == "tictactoe:x_on" then
+		mesecon:receptor_on(pos)
+	end
+end)
+
+minetest.register_on_punchnode(function(pos, node, puncher)
+	if node.name == "tictactoe:o_on" then
+		mesecon:receptor_on(pos)
+	end
+end)

init.lua~

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+-- TIC-TAC-TOE BOARD MOD
+-- by whiskers75
+
+minetest.register_node ("tictactoe:x_on", {
+    drawtype = signlike,
+    description = "TicTacToe X",
+    tile_images = {"tttx.png"},
+    inventory_image = {"tttx.png"},
+    sunlight_propagates = true,
+    paramtype = 'light',
+    walkable = true,
+    material = minetest.digprop_constanttime(1.0),
+   })
+
+minetest.register_node ("tictactoe:o_on", {
+    drawtype = signlike,
+    description = "TicTacToe O",
+    tile_images = {"ttto.png"},
+    inventory_image = {"ttto.png"},
+    sunlight_propagates = true,
+    paramtype = 'light',
+    walkable = true,
+    material = minetest.digprop_constanttime(1.0),
+   })
+
+mesecon:add_receptor_node("tictactoe:x_on")
+mesecon:add_receptor_node("tictactoe:o_on")
+
+minetest.register_on_dignode(
+	function(pos, oldnode, digger)
+		if oldnode.name == "tictactoe:x_on" then
+			mesecon:receptor_off(pos)
+		end
+	end
+)
+minetest.register_on_dignode(
+	function(pos, oldnode, digger)
+		if oldnode.name == "tictactoe:o_on" then
+			mesecon:receptor_off(pos)
+		end
+	end
+)
+
+minetest.register_on_punchnode(function(pos, node, puncher)
+	if node.name == "tictactoe:x_on" then
+		mesecon:receptor_on(pos)
+	end
+end)
+
+minetest.register_on_punchnode(function(pos, node, puncher)
+	if node.name == "tictactoe:o_on" then
+		mesecon:receptor_on(pos)
+	end
+end)