* Checks cylinder compression from 0 to 300 psi ( 0 to 21 kg/cm2).
* Adapters fit 14 and 18mm spark plug holes and a special air-hold.
* Valve is included to easily reset gauge and one 12" rubber hose.
* Run engine long enough to bring crankcase oil to normal operating
   temperature.
* Stop engine and remove all spark plugs and their gaskets.
* Block choke and throttle valve in "open" position.
* On standard ignition, remove high tension cable from distributor cap and
   ground it. On HEl, remove three terminal connectors and battery connector.
* Select the correct size threaded adapter.
* Screw adapter into the spark plug hole.
* Crank the engine four compressions to obtain maximum reading, make a
   note of the pressure in each cylinder.
* To remove the gauge from spark plug hole, depress the valve below the
   dial, releasing the pressure.If compression readings vary more than 10%
   between cylinders further tests should be performed.

* Checks cylinder compression from 0 to 300 psi ( 0 to 21 kg/cm2).
* Adapters fit 14 and 18mm spark plug holes and a special air-hold.
* Valve is included to easily reset gauge and one 12" rubber hose.
* Run engine long enough to bring crankcase oil to normal operating
   temperature.
* Stop engine and remove all spark plugs and their gaskets.
* Block choke and throttle valve in "open" position.
* On standard ignition, remove high tension cable from distributor cap and
   ground it. On HEl, remove three terminal connectors and battery connector.
* Select the correct size threaded adapter.
* Screw adapter into the spark plug hole.
* Crank the engine four compressions to obtain maximum reading, make a
   note of the pressure in each cylinder.
* To remove the gauge from spark plug hole, depress the valve below the
   dial, releasing the pressure.If compression readings vary more than 10%
   between cylinders further tests should be performed.