A/C compressor does not engage?

Fuse is good.
The A/C clutch only engages when I jump the low-pressure switch.

I've replaced the switch and there is power to the purple wire.
I've vacuumed the system and have 20lbs. Of pressure on my gages but still no clutch engagement.

I'm using Vevor gages and manifold to monitor high and low side pressure. When I pull vacuum the high (red) gage gives me 28lbs. Of vacuum. The low (blue suction side) gives me about 10 lbs of vacuum.

Any ideas?