Kevin
I have taken the dash out of MG's many times. It's not as bad as they seem. I first tried to take the gauges out like you want, but a couple are very hard to get at. Take the dash out completely. Disconnect battery. With your model start at the glove box. Once removed, you can see center vent hoses,. take those off. Your dash has a couple of main wire harness connections to unplug. Now use a 1/4 inch socket set, with a couple of long extensions. You will see the first of 6 nuts that need to be removed once the glove box is removed. You might be happy to see that all 6 of the original nuts are not on the studs, reasons like Limey stated, it could have been removed by a PO and no need to replace all if it seems like it's all tighten up.
Once removed much easier to work on the gauges. and put them back in place. An afternoon job at most. And you learn and can see if any wires in dash need to be replaced, or given attention too. One thing I have seen happen is the wires put back on wrong when you try to work on your back and have to use the feel touch. I just like to do it once, so I try to do it right, the first time.
Ken