Just my .02$, but I would think the EGT sensor and gauge would be the last things you would want to do on the cheap. Well maybe a close second to the brakes.
I think you got a bargain there, the setup seems the same as other more costly systems. Providing it works that is.
I think I will replace my 600-2,400F gauge with this one if my car passes the MVI at the end of this month.