I read the instruction but there was no obvious hint how to hook the display to a teensy, only for Mega2560 and Uno. Maybe somebody else with the same hardware configuration might assist you further on.
You could also search this forum with keywords "teensy lcd_2000" - then you might find previous or current discussions going on with similar or same issue.
Ok here is a page describing how to hook up a Nokia 5110 screen but I cannot figure out which pin to use on the inhaos LCD for DC=data command or mode select.