Engine/Transmission (1998.5 - 2002) what pin do i connect to?

[Mhannink]

ok so i want to put a mystery switch in but i dont know what pin/wire i need to connect to i looked around here but couldnt find anything. would someone please tell me would be great to have this thing going thanks matt

 

[champspa]

don't know about a 99 but the TST Products, Inc. site has the diagrams for earlier trucks

 

[SGrasmick]

Mystery switch as in convertor lock up???? if so its very easy, Just did it on mine