Need a little help with my speedo...

[gtxracer]

Alright, so maybe I'm still a noob at this (hope not), but I can't get my Mamba Max Pro to calibrate. Bought it new today, straight soldered all 3 motor wires to my Tekin T8 1700kv. Hooked up the sensor plug, soldered on the TRX connector and connected up my 4s Neu lipos. Nothing. Tested the Rx with a Rx pack - good to go.

All 3 LEDs blink at once, about 1 or 2 seconds apart, constantly. The Rx blinks once with them at the same time. What gives? Tried reversing the throttle on the M8, nothing. I tried my other Rx just to be sure and nothing. The motor wire points and the speedo wire points are labeled A B C, so I didn't screw that up. Suggestions?