Obdlink LX + speeduino vss

Can I use multiple connections for inputs? I can get everything i need from the stock ecu except speed. the android tablet im using doesnt have gps. can I use speeduino and obd2 both?

something else, id be willing to purchase a gps dongle for my amazon tablet im using for the dash if i could also easily integrate something like that!

Yes, use as many connections as you need.

RealDash supports NMEA- compatible GPS dongles.