Your gauges should come with several adapters in the kit. Mine did. You may have to combine 2 to get the right size, but I have never had to go out and buy additional fittings to make it work.
Hissin:
I see what you're saying, but the threaded port on the water neck is closer to the intake than the hose, so if the Tstat stuck closed; would I still get the readings of the coolant in the block side still just like the stock sender?
Dosent coolant flow into the block from the lower hose, then up and out the water neck into the radiator through the top hose or do I have that backwards?