the check engine light in my Lexus 2002 is300 doesnt turn onwhen I turn the igni

SLIM ,that is why I suggested having it scanned to SEE if it is being COMMANDED on......BEFORE tearing a perfectly good instrument cluster apart and making things worse! TEST ALL fuses FIRST! May be 3 or 4 fuse boxes under hood and maybe under both sides of dash/side kick-panels.

BTW what is a "MIL"

MIL = Malfunction Indicator Light, also known as the Check Engine Light (CEL).