Hyundai dealers have access to the Hyundai factory service department and they can help you get any tools or cables you need to hook up. They can also provide valuable information at times.
It has a Hyundai D4DD diesel. FWIW, I ordered a new ECU from Amazon of all places. It came from a seller named "Big Tiger" in Korea and it arrived from Korea in 6 days ! Genuine Hyundai part complete with hologram stickers on the box. Cost was about $1,300. (Hyundai's price was $4000 but even at that price they could not actually supply one even from Korea)
If I know correctly, Spectrum is tools for LPG system.
If I know correctly, 70D-7E equipped with Mitsubishi S6S engine. You no need to use tools, it is mechanical engine. If you have error codes and wrench or something else symbols, on the dashborad, there are transmission symbols. If you Hyundai dealer, just read the service manual of transmission. ZF transmission, very good.
If it has the Cummings engine,you will need to contact a Cummings dealer. They have the only way to connect.