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Couple of things you can do. First figure out your gear ratio then you should be able to determine what rpm you SHOULD be doing. The other is to get a automotive multi-meter with a tach function and compare that to your in-dash tach.
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44 Willys MB
52 M38A1
64 Corvette Coupe
68 Camaro 'vert LT1 & TH700
69 Z/28 355 12.6's @110
69 Chevy Short Step 4 1/2"/7" drop
72 Jimmy 4WD 4spd 4" & 35's
02 GMC 2500HD 4x4 Duramax
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