Jim Wilkins wrote:
"Steve W." wrote in message
...
Oh the old unit uses nothing more than a bog standard air pressure
gauge with a "compression tester" face on it. The spark adapter
fittings are the part that makes it special.

Steve W.

If the check valve was further up the hose the dead space would lower
the reading.



I have units with the valve at the tip and one with the valve right at the gauge. No
difference in the readings but they ones at the adapters are easier to change out.

--
Steve W.