Engine should be fully warmed up.
All plugs should be removed.
Ignition should be disabled. (Procedure is different on different cars. Will let Johnny Mullet or some other metro owner supply that info.)
Throttle plate and choke plate should be wide open.
Use remote starter switch to (or have assistant) crank engine while you note compression guage reading on 1st and 5th stroke. (Should have ~2/3 specified compression on 1st stroke. Should have full specified compression on 5th stroke.)
Here is a more complete write up -
Popular Mechanics Complete Car Care ... - Google Book Search