Figured I'd share some info I stumbled upon. For anyone out there looking to test their glow plugs easily, or anyone who does a lot of them, you can buy an glow plug test harness that plugs into the connector on the valve cover to allow you to easily test the glow plugs with a ohm meter.
OTC Tool Manufacturer for Cars and Trucks : Products
Looks like they run about $110.
Now, if you don't want to pay the money for that, I found this place that has the connector pigtail, so you can make your own for about $30 by just extending the wires a little on the pigtail and putting on your choice of clips/connectors.
Source Products, Inc. ~ Ford Repair Harnesses ~ Ignition
99-8612 is the one you want.
Just an FYI for everyone.