Using old gauges?

[79BIG10]

I know a few guys here are going back to factory gauges on their trucks including factory style tachs. I'm just curious to the reliability of these older gauges. I've kicked around an idea on going back with a factory style gauges until I can get Autometer gauges in a few years. The volt, oil and water ones I have now are nothing special aftermarket ones and hard to read at night which makes me want a older style again. But if the guages are not going to read good for me then I want to wait. I still have the factory speedo and fuel there which is no problem to change out to the tach style cluster but if the gauges I were to find were bad how hard are they to get fixed? I know I can buy new ones of course but that is more $$$ than I would want to spend.