Don't know about digital, but Autometer makes Analog EGT's with dual inputs.
I have a single input EGT...
2000 SVT Turbo 295hp/269ftlb@12psi
#1 for Bendix Brakes Kits!
Knuckles rebuilt w/new bearings $55
AUSSIE ENDLINKS $70
Gutted pre-cats $80/set
A lack of planning on your part does not constitute an emergency on mine!
Here is a decent site. My boss is using the altronics red alert system w/ 8 probes on his 1500hp 70' vette . Its not listed on this site but they do have some dual egt guages