The ‘shop’ pulse sensor (it isn’t a “meter”, just an optical pick-up) does plug straight into the emonPi and work, but not into your bare Raspberry Pi. For that, you’ll need to connect into the GPIO and run a separate script to get the pulses - it’s documented here: Directly connecting to Optical Pulse Counter with RPi? - #2 by pb66
You only need the RFM69Pi if you’re receiving radio messages from an emonTx or an emonTH. The RPi will use its built-in WiFi to connect to your router.
You don’t mention whether you have PV - if you do, remember that the pulse LED won’t work when you’re exporting.
And of course you need power for your Pi.
Or, you could buy the emonPi parts minus the Raspberry Pi itself. I’m not sure what you’d need to order, you should contact [email protected] for the details.
That you give you a voltage input and two inputs for current transformers, and the ability to plug in the pulse and with an extender socket strip, temperature sensors.