A little w124 weirdness

[rrgrassi]

Guys, while driving day before yesterday, the ABS light came on, and the tach dropped to zero and the AC clutch disengaged. About 3 minutes later, the ABS light shut off, tach came back, and AC clutch re-engaged.

Yesterday, the AC clutch again disengaged, but came back about 3 minutes later. No ABS light, and tach kept working.

So my question is, it this a sign of a failing Klima or OVP relay?

Thanks!