guage cluster questions

[mstrgrn]

Hello,
I recently bought a guage cluster from a swap meet. It looked in fairly good shape, so i figured i would replace mine, since nothing worked and it was pretty much junk. The problem i have now, is that when i install it, the blinkers run the temp guage and high beam light, and everything is weird.

Could this be a short in that plasic board on the back?
Or are these varying from year to year, and i just bought the wrong part?

by the way i have a 72, and it had all of the same guages as the one that was in my truck...

thanks in advance