Mamiya AE Finder FK402 Metering

I have the FK402 attached to my Mamiya 645 pro and have a question regarding the metering.

When set to A mode which is in effect Aperture Priority, the camera will automatically select the required shutter speed for you.

Question:
When I have the above set, I see a green LED light up in the viewfinder when the correct exposures has been calculated but what is confusing me is... how do I know what shutter speed has been selected, how do I know that it selected a shutter speed which can be handheld ?

That prism does NOT indicate proper shutter speed for selected aperture. A green LED shows if the indicated speed >1/60 when the shutter release is half pressed. And if the speed is < 1/30, the underexposure symbol ▼ blinks to warn of possible camera motion, with rate of blink increasing (2Hz - max 8Hz blinks) as shutter speed decreases.

How do you find the AE on these cameras. So far I have only used an external spot meter and really wanted to do so street works with it.

From the owner's manual;

The AE Prism Finder FE401 The Mamiya AE (Automatic Exposure) Prism Finder FE401 pentaprism guarantees a true, upright image and features built-in electronic shutter control which ensures aperture-priority, TTL automatic exposure metering while in the A or AEL mode. <3-Way Metering System> The FE401 comes with three metering modes: average metering (AV), spot metering (SP). and AV-SP metering capable of automatically selecting AV or SP according to subject conditions. The LED display in the viewfinder indicates correct exposure. If you forget to extract the Dark Slide when the finder is being used with the 645 PRO TL, an LED will flash a warning.

AE Reflex Finder FK402 This aperture priority, Keplerian type, automatic (AE) reflex finder features TTL auto or manual exposure with center weighted averaging. It offers upright, eyelevel viewing with unreversed image. Exposure is indicated by red and green LEDs.. A built-in adjustable diopter eyepiece can be set from +/-5 for viewing convenience without eyeglasses