Why is my 2018 Cherokee only try to start when I have my foot on the brake?

Question

Everything went together easy enough. But I didn’t see a pink/grey wire for the temp gage. My car doesn’t have the temp gage under the steering wheel but it does have wires that run to where it looks like it would go. So I ran the yellow wire to the pink/green wire for the temp gage, this was the only thing I didn’t follow in the directions. Everything else went smooth. But it won’t turn the car over when I try to start it unless I have my foot on the brake(also doesn’t start when the park brake is on). When it tries to start while my foot is on the brake it shuts off immediately.