Yeah, if you dont have the ej1 then the screen is only use for as a tv or reversing camera or some thing like that.
Also there is no oil pressure or boost pressure, it has rpm, speed, power (how it gets the power im not sure but it was pretty close), gforces for accelerating and breaking (no side to side) and then a whole heap of pit stuff that somehow gauges tyre wear and other stuff.
I didnt like it and got rid of it, wasnt really what i wanted, was just a little gadget to tinker with.
Dont remember what site still sells them, will have to do a search.