New member with old gauge problem

Hello,
I'm in the process of repairing my gauges in my 70 dart rallye cluster with a failed/burnt voltage limiter and fuel gauge. I've tested the temp and oil gauges and they both test fine. When this problem occurred the fuel gauge went to empty and the temp and oil went to the max. I was in the process of starting the car after winter storage and don't know how long the gauges were receiving a full 12V but it could have been several minutes before I got back in the car and noticed the problem.
My questions are, how easy is it to track down a NOS Fuel gauge/limiter assemble and would the other 2 gauges assuming they received 12V for several minutes be compromised to the point that they may fail shortly too? Does anyone have experience with the gauge pack and solid state voltage limiter offered through "Charger Specialties"? I have a few local sources to check but I'm probably looking at a used gauge at best. Any info or suggestions would be great, I'm looking at fixing this problem long term with the best possible solution.
My apologies for being long winded. Thanks, Heath