I've read this 4 times now....and i literally have no idea what 90% of these words mean
Allow me to translate
Getting the new motor running and talk to the stock can bus system is easy.
Mark means "For me it's easy as I've been playing with the ECU's (Engine Control Unit's) For years"
Use a Syvecs S8 ECU (Syvecs = after market ECU manufacturer S8 is the model number you would probably use an S6 on a 350z but the S8 on a V8 and it has more functions) So he menas take out the Nissan ECU and put in a Syvecs ECU
configure the custom can (CAN = Control Area Network) from the Syvecs to talk to the stock ambush circuit via canbus (CANBUS = A communications protocol that allows devices and computers in a modern car to communicate with each other. It allows modern vehicles to have such functions as increasing the volume of the stereo as you speed up and slowing down the windscreen wipers when the car stops.) box and your dash/heater BCM (BCM = body control module) will all work like a stock car.
So he means your rev counter, AC controls, warning lights etc etc will all still work without having to change the dash out or put in after market gauges.
Full traction control as well. I recon you got this bit but Mark points it out as the Syves traction control is awesome I know I've had a demo :
I hope that helps