I have an Amps gauge to hook up. How!? Also why the hell do I want to know my amperage?

Also got a boost gauge in kg/cm^2 that I'm not sure how to interpret. What the hell sort of scale is that? I've never heard of a scale so metric!

Boost isn't going in yet, but bought it so I have a clue what my turbo is doing when it arrives

They're Omoni gauges. Coolness

Any help appreciated
Sam