having problems wiring in my Sun tach

[BigBlockSam]

hey

  somebody gave me a sun super tach 2 . it has no wiring harness . so i took it apart to wire it up again . on the inside it has 4 posts .There labeled   . G , L , B , T .  I figure.

G- would be ground

L- would be light

T- would be trigger

B - i have no idea . do i have any of this rite. 

[tan top]

 think the B is Battery

 have a look here  

http://www.tradervar.com/All%20Other%20Sun%20Tachs.pdf

  just for referance ,  my auto meter tach & seen a few others with the same  color coding

  ground = black
  lamp = white or blue
  minus side of the coil / trigger  = green
  battery/ignition = red

[BigBlockSam]

  got it thanks