I believe it's the combo switch.
I took off the steering wheel (not to hard, cracked at second try with 100 pound son holding wheel and 3 foot cheater) and took out the combo switch. Checked it out, cleaned it up though I saw nothing to indicate a short and put it all back together.
Still pops the fuse in right turns though. Unplugged the combo switch.
All gauges and brake lights work.

So, does this mean it IS the combo switch or could it still be something past the plug for the switch? Should I spend the $130 for a new one from Phil?

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Ginny in Denver-ish
78 300SD, 265K (mine)