Thanks for the complements everyone!
Well yeah, my thought was im not sure how often ill use TC and to what level, how well it will work ect, so wasnt a highest priority, start button i wanted to get to easy and can do blind (full face helmet and HANS is bit restrictive looking down low) so put on the wheel so if i spin and stall, which i will, and theres a car coming i can start quickly. Yes i can setup auto restart like some V8 supercars have were i would press clutch and throttle both to 100% to re start if i stalled within few seconds ect.
I was debating ECU or DASH, was going to be 50/50, but then when i was thinking TC ive decided all 4 to ECU's 4 DI's, im assuming this is the best way for the ecu to control TC, it means i would be logging them slower then if thay were in the dash direct, but thats not a worry.