2004 Vortec 6.0 Into 1991 C2500 Questions

[LOW RADO]

I AM IN THE FINAL STAGES OF INSTALLING A VORTEC 6.0 FROM A 2004 SILVERADO WITH A 4L80E TRANS TO MY 1991 C2500 SILVERADO,

 

WHERE IS THE TEMP GAUGE SENSOR LOCATED??

 

WHAT IS THE SWITCH DIRECTLY ON THE REAR OF THE MANIFOLD WHICH MOVES IN AND OUT APPROX 5-10MM??

 

WHAT IS AND WHERE CAN I PURCHASE THE BLUE SWITCH MOUNTED DIRECTLY THE THROTTLE BODY?? (APPEARS TO BE SOME KIND OF VACUUM LINE)

 

WHERE CAN I PURCHASE 2 OXYGEN SENSORS TO SUIT MY ENGINE?? (4 WIRE TYPE)

 

AS I AM LOCATED IN MELBOURNE AUSTRALIA AND PARTS ARE NOT EASY TO LOCATE SO ALL HELP AND INFORMATION WOULD BE APPRECIATED.

 

CHEERS DARREN