Cool looking dash. My truck doesn't deserve anything that nice. Anyway, here's a diagram and description that may clear this up for you. This diagram is for a "99 LS engine from a Silverado. The description below it is also informative.
'93 Chevy 1500 4X4 ECLB with a '99 Silverado LQ4 6.0 and '99 Escalade 4L60E. SOLD IT!!
New toy: 2001 2500 HD 4X4 Extended Cab Long Bed
John