LS Speartech Harness With Rostra Cruise Control Switch

[NC_John]

I've got a speartech dbw standalone harness, with cruise control included in the harness. The cc wiring from the harness is:

brake and clutch pedal switches (straight forward)

the control functions:

Gray - off/on (gm stalk switch)
Gray/blk - resume/accel (gm stalk switch)
Dk blue - set/coast (gm stalk switch)
Lt blue - to normally open brake switch (same to wire as brake lights)

Seems straight forward but my ididit column has the rostra 250-3020 four wire stalk with no documentation as to which wire is what. Speartech said they didnt think the switch would work (with no explanation as to why). I've contacted Rostra to see if they can give me the info I need but havent heard back yet.

Does anybody know anything about this switch or used the combination?