Vacuum gauge

They just aren't that expensive at the parts store............................

20 bucks or so, and I'm not saying this one is "special," just the first couple of Google hits, but it sounds about as I remember price.

http://www.oreillyauto.com/site/c/d....oap?ck=Search_N1745_-1_-1&pt=N1745&ppt=C0103

[ame="http://www.amazon.com/Equus-3620-Vacuum-Gauge/dp/B000EW0KPY"]Equus 3620 Vacuum Gauge : Amazon.com : Automotive[/ame]