Mike,
What did you do for the coolant sender.
I bought jegs gauges.. Which don't fit the coolant port on the head, so I bought the ls sender from auto meter that fits, however it's a different resistance than the jegs sender. Only reason I bought he jegs package was due to the programmable speedo, and the the fuel gauge was the correct ohms for my fuel cell sender.
So I'm just about to drill the port in the head to 1/4" npt and call it a day. I'm just curious what you did.