The gauge on my old compression tester decided it had served well enough af
ter several years of non-use, it's demise helped along by a good dose of ru
st. I needed one for a project car I just started working on so I went ebay
shopping for a replacement gauge to go on my hose & adapters.
I found a Proto CTR-20 gauge on ebay, USA made, brand new according to sell
er, with a release valve for a good price of $15 including shipping but the
re isn't a check valve to hold the pressure for cumulative readings. On my
old gauge, it must be built into the gauge's body as I don't see any kind o
f external check valve on it.
When cranking the engine, the needle jumps up to max and back to zero for e
ach cycle. I'm not familiar with how a standard automotive compression test
er is supposed to work here, other than it should hold the pressure and inc
rease the reading a bit with each crank cycle of the motor.
Can anyone enlighten me on how to get this working the way I remember it sh
Here's the gauge screwed onto my hose:
9 years ago