trx125

I got a new gauge cluster for my truck it has the Tran indicator in it the only one that works is reverse. checked the plug and reverse is the only one with a pin for it. P N D L2 L1 has no pin or wires in the harness. I wonder why not any comments are welcome. i think it is weird that only reverse is there and none of the others are. What can i do to correct this problem? thanks (sorry for the spelling have been up sine 3 this morning)