Speed cut defender / Turbo timer problem

[abcent]

I need some advice.....I have a Blitz MSTT in my car which has the 1/4 mile,1/2 mile,speed, top speed, 0-100km/h, 0-200km/h, 0-300km/h functions which currently dont work because of the speed cut defender that came in my car (i have no idea where it's installed). My timer needs to be hooked up to the speed wire (yellow/green stripe, pin #53 i think, is the wire it's hooked up to currently), but due to the defender only reads at half speed.

my question: Where is the speed wire that gives "actual" speed? so I can hook my timer up to it and get all the functions working correctly.

can anyone help me?