>> 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. :)

I remember during the gas shortages of the late seventies, vaccuum gauges
were a very popular option - and were standard equipment on many cars.

My friend with a Mustang II had one - from the factory.

Marshall Ruskin