Trying to get this thing to work

[JAZZCNC]

I don't mind manually turning on the spindle, but I would like to know the rpm. When I received the machine it came with a generic controler program. I put it in while waiting for mach3. The spindle worked, but the only control was in the box.

Again difficult to help without more info or pics.
However, Mach won't tell you the real RPM of the Spindle, it will only tell you the RPM which was programmed in the G-code and if you have a controller capable of providing speed reference voltage for whatever controls the spindle speed ie: VFD it will set the voltage according to the G-code or RPM you enter.

But it won't tell you the real RPM the spindle is spinning at unless you attach a Single index encoder to the spindle and feed it back to mach3. Not something commonly is done or found on routers.

Give us the info and we'll get you going.