Gauges for 1970 Skylark?

Buick Ownership
1970 Buick Skylark
I am relatively new to cars. I want to replace the gauges in my skylark with some newer ones because getting original gauges are far too expensive. I need a speedometer, a tachometer, and a gas gauge. What I need to know is how will I know a gauge will fit and/or work with my car?
Buick Ownership
2007 Lucerne CXL. and 1995 Lesabre currently, past 1973 Riviera, 1968 Riviera
That's a little opened ended and depending on how they are going to be used. Analog or digital, retrofit or custom, ad on, size, etc. Once it's decided on type of gage, then you can check with the manufacturer on how to make it work for your vehicle. Speedo is the one to confirm for your car with transmission and rear axle ratio.

Here's some gages to take a look at:
1970 Buick Skylark Individual Gauges - Gauges & Accessories - Page 2 @
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