Changed my water temp sending unit and still nothing on the gauge.

Title says it. All of my other gauges work, even fuel. Water temp is dead though. Figured I'd swap out the sending unit and problem solved but it didn't go that way.

1. Found out that when you take out the old sending unit coolant will flow out making a nice puddle in the intake. :-(

2. Replaced the sending unit and let the car idle for a few minutes to come to temp. Nothing on the temp gauge.:-(:-(

Where should I start?