Full racing electronics?

I used to bracket race my four door, four speed, '65 Plymouth Valiant at Fremont Raceway back in the 1970's. Last nite I went to Sonoma Raceway (as a spectator). I noticed on the raceway today something I was not familiar with under their Wednesday nite drags classifications:
•
Jackpot
Open to vehicles 7.50 and slower. Cross-Talk permitted.
Additional fee collected prior to eliminations. Vehicles
may have full racing electronics

I don't have a clue what is meant by "Cross-Talk permitted" or "full racing electronics".