What does Neil McCauley mean with “I'm a needle starting at zero, going the other way, a double blank.”?

Question

During Heat Neil McCauley (Robert De Niro) says to Eady (Amy Brenneman):

The last thing I am is married. I'm a needle starting at zero, going the other way, a double blank. And then someone like you, comes along.

What does he mean with that?

My thoughts on this:

• "Needle starting at zero"? He compares himself to a speedometer? Or metaphorically to an empty vessel? He doesn't have anybody in his life. It makes sense. We know that he's a loner, professional criminal. No serious attachments in his life, other that his fellow gang members, who have sort of developed a kind of friendship, you can notice.

• "Going the other way." The speedometer shows negative velocity? He lives contrary to most other people? Not sure.

• The other part I don't understand. "A double blank"? How does it fit? I really don't quite get it.

If anybody knows about this, kindly let us know.

Answer 1

I think “a needle starling at zero, going the other way.” Refers to an analogue thermometer which somehow resembles his life getting colder and colder below zero, freezing even. and since the movie is called HEAT, he finds Eady as someone who gives him warmth. “Double blank” is just something you say to exaggerate that you really got nothing left at all.

Answer 2

According to Michael Mann:

DEADLINE: So you have the equally competent cop and robber who think they are in control, but can’t control the circumstances of people swirling around them…

MANN: There’s Neil, living a catechism of non-attachment. That is the smart way to live your life when you’re living outside the law and you come from circumstances of alienation and loneliness. You maintain your loneliness, you maintain your alienation, except for your bond to your partners, and you don’t get attached. You don’t have anything in your life you can’t walk from in 30 seconds flat. Because you’ll make one phone call, two years from now in Brazil, and they’ll be tracking that call and if you have sentiment for that woman, they’ll locate you. So you don’t get attached. You leave that for after you’ve scored and take off.

Then he described his life to Eady as a needle starting at zero and going the other way, a double blank and then you come along. So he abandons it and there’s an initial rush of living an emotional life spontaneously, which he’s not supposed to do. In making that happen, he’s abandoning navigation. So then he’s susceptible to being seduced with vengeance to go get Waingro, which is his undoing.

IMHO trying to parse it too closely is missing out on the odd poetry of it. Technically a needle cannot go below zero (although there are meters where staying below zero is a good thing, e.g. decibel meters), and that is in a way his point: it's not like he hasn't had the opportunity or that he wasn't that interested in the past, he actively avoided it.