I bought a set of these from Harbor Freight a week ago on a big sale they had (And may still be having) - only $15 or so for the gauge and base. I'm not sure I would have been willing to invest more than that.

I have to change the front rotors on an 85 380SL which requires hub removal (the 86+ doesn't). I think an experienced mechanic should be able to do without one but I'm very rusty and don't have my "torque feel" back yet. It might also be useful for testing for runout, which I feel is caused 98% of the time by trapped junk between the hub and rotor anyway.

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86 560SL
With homebrew first gear start!
85 380SL
Daily Driver Project

http://juliepalooza.8m.com/sl/mercedes.htm