How do I know if the turbo is working?

[Trevor]

I found a 1987 Turbo Coupe which I am thinking about buying for the engine. I am going to put it in my 1990 lx 2.3L First of all the engine starts up but then cuts off if the gas is let up. The car is not in too bad of shape and has 150,000 miles on it, I am planning on rebuilding it any way. My problem is that i don't want it if the turbo is no good. There is a turbo gauge in the dash that while the car is running(briefly) registers nothing. For all I know it (the gauge) could just be broken. Is the turbo working? How am i to tell, is there any way to be certain it is working. I am not sure if the car will move since the engine cuts off so i don't think a road test will work to see if it puts out any power. Any suggestions? Also i want to know if the rear end from the Turbo Coupe will fit on my mustang?