how do I connect my LRP80750 sphere comp tc-spec speed control to my
LRP50850 vector X-11 stock spec 17.5 turn brushless motor ?

you will c the letters on the speedo that say a,b,c follow the wires and soder those wires to the motor the motor will have a,b,c on it to

If it's a Novak ESC it will be written. So you can match the cables with the labels on both end.

I am using TC-Spec too with Vector X-11 3.5, this is what you should obseve,

Motor ESC
A = blue
B = yellow
C = orange

You can't get wrong with this simple configuration. Unless if you are color blind.

I am colour blind a bit and I blew up my Sphere

That's real most expensive lesson. After all TC Spec is not cheap compare with others ESC.