So what's the difference if the purple wire is hooked up to the brake instead of the rpm signal?

 

From my experience, I had a Greddy tt in my 240 and it only flashed red n blue when ur e-brake is down when u take the key out. The time it goes up an down is a feature it has. U can turn it off and have it turn off at 1:30 every time. You just keep pressing 2 of the buttons at the same time... i fergot which ones... it says in the manual. It lets you switch between hi and lo modes as well as a mode with a set time that wont move. On the freeway, your time will keep jumping up because it adjusts itself depending on what's RPM you're at and how long it's been there. So on the freeway you're on average around 3k RPM for like 20 min... it'll jump up to around 8 min even on the LO setting. Normally, if that happens and i have'nt been spooling my turbo, before u take the key out, just hit the power button and it'll reset to 1:30, then take the key out. When it starts counting down, hit the time button and it'll raise the time to what u want... i usually do like 2 min after a 20 min freeway drive. BTW: even if you e-brake is down and it's flashing, i dont think anyone can steal your car still if they hop in, because once u roll the car like a couple MPH, the turbo timer will shut the car off.

 

Blue is fine. I hooked up mine myself, with the wire to the E brake. It set to 1.30.