That figure is low .
You need to do things to make the right test .
Start engine , run till operating temp .(heat coming out the heater , and defrost )
Remove all 6 plugs .
Then start on either side of the engine , and block the throttle all the way open .
You Need To see the needle of the gauge leap 4 to 5 times for each cylinder .
As I said record this reading on a piece of masking tape attached to your hood .
Now note which of the figures are low .
then determine who low they are compared to the highest ones .
should be no more than 10-15% difference.
Next add 1 teaspoon of oil to the cylinder that is low , If you have more than one tht is low , do them one at a time . now record your readings
THis is where it get's hard .
The cylinders that were low , and you added oil to , should have come up in reading , IF THE compression ring ,is bad , the oil helps to seal .
If nothing happens , it may be a valve not sealing in the seat .
You can also use a vaccum gauge to " READ the engine" http://sbftech.com/index.php/topic,3020.0.html