We just did a conversion of a Point Blank 2 kit game to Happ guns and it was a little different from everything else that I've seen mentioned on the forums, so figured I'd follow up here.
The picture below is of a 15 pin amp mini plug from PB3 kit manual, but it is exactly the same for the guns on PB2. So, in effect, this would work for both.
The connector is a 15 pin stacked in 3 rows of 5 pins. It counts right to left 1-5 top row, 6-10 second row right to left, and 11-15 third row right to left.
The Happ guns are as follows:
Red - 5v
Black - ground
white - trigger
blue - sensor
So, for gun player 1, you tie the following:
Happ Red 5v -- pin 4 (red wire)
Happ Black ground -- pin 8 (black wire)
Happ white trigger -- pin 7 (blue wire)
Happ blue sensor -- pin 9 (white wire).
Gun Player 2, you tie the following:
Happ Red 5v -- pin 5 (pink wire)
Happ Black ground -- pin 13 (black wire)
Happ white trigger -- pin 12 (wire color is different than listed in the manual, so can't remember, but count the plug properly to 12)
Happ blue sensor -- pin 14 (wire color is different than listed in the manual, so can't remember, but count the plug properly to 14)
There will be two wires on each gun not used that you can just tie off, one is for the 24v and one for the gun lamp.
Go into test and calibrate your guns and you've successfully converted a PB2 or PB3 kit game with the filter board to Happ guns.