instrument cluster polarity for VDO clock
 

Hello all. My clock in the 220D isn't working. I have a replacement cluster that I want to practice on before tackling the real clock and cluster.

I see the clock terminals for power are brass and aluminum colored, with one brass colored male spade.terminal. Which is positive and which is negative?

I want to test this clock to see if it works so I am going to hook up 12v to the proper terminal to see if I get any readings.