I think that:
1. EVO device is a modem in the form of a 3G dongle and works with routers supporting such type of devices
2. Wingle device is a modem plus wireless 'router' combo device and it allows you to just connect power to it and it'll setup the connection making it available via WiFi (upto 5 devices) ... like the EVO Cloud but without battery!
So, if you don't need more range/coverage and happy with limit of 5 devices at a time, you can just use the Wingle Device on its own giving it power via USB (mobile chargers also work ... good one would be 5V around 1A)
But, in order to use 2 with added range and increase in number of connections, you need to make sure:
- If Wingle device can also act as a modem i.e., there is an option to make it work like your old evo device, then, you would have to enable that option to make it work with the router
- If Wingle cannot act as modem, then, you'll have to repeat its wireless signal via Repeater Function ... your router may already have this function builtin so you may refer to its manual ... if not, then, either you can buy a Universal Repeater or you can try to use third-party/custom firmware like openwrt (difficult for beginners and risky as firmware flash gone bad 'bricks' the router) or dd-wrt (friendlier) or tomato (recommended) if your router can support it ... these types of firmware make it possible to setup repeater function!
Note: I don't own a Wingle device!