speedometer wiring to mast ecm? help!!!

[68rsz]

hey guys i have a ls3 from mast motorsports with a m-90 ecm with a tko 600.how do i wire an autometer spedo? straight from the tko or through the ecm. i am not running cruise if this matters.

[gkring]

The signal will come from the trans. I think the MAST ECM has or will have a CAN system for the gauges, but speedo functions will still have to involve a signal from the trans due to the different gears.

[68rsz]

thanks alot ill try it .thats what i was thinking,wasnt sure if there was any reason mast ecm would need to know vehicle speed.