> Vacuum is pretty useless unless you have a turbo and can watch the
boost
> kick in.  It will only show big vacuum leaks, way out of spec
timing, or
> bad valves; all of which you can avoid with good maintenance.  Oil
temp

well, actually, a vacuum gauge can be quite useful .... it's a
miles-per-gallon meter. :) if you use it to ease your speed on the
highway, you can get better mpg. high vacuum means the engine is
really sucking the air in ... and fuel, too. mercedes used to put
vacuum gauges in several of their models, but the readings were in mpg
rather than bar or in. of Hg. :)