Gap it to 0.7m You do not want to close the gap too much or it will burn to hot and faul your plugs too soon. Make sure your useing a metric gap. If you have a thousandths gap gauge, go to between 27 and 28 thousandths of an inch. Here is a conversion table for you to print out.
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Check electrode gap with a wire-type feeler gauge. Bend
the outside of the electrode so that only a slight drag is felt on the
gauge as it passes between the electrodes. The proper
gap measurement is 0.038-0.043 in. (0.97-1.09 mm).
If you're replacing the spark plugs in your car
engine, you'll need to set the gap before reseating the
spark plug. The gap is the distance electricity arcs between the ground
electrode and center electrode. The gap must be set correctly to ensure
maximum performance. Here's how to set the gap of a spark plug.
Remove the spark plug wires. Use a socket wrench to remove the spark plugs from their chambers.
Clean the spark plug if you are not replacing it with a new one. Remove all dirt and debris from the spark plug.
Check the owner's manual for your car (or any appliance with spark plugs) to find out the recommended gap setting.
Use a gap tool to check the gap of the spark plug. Slip the
tool between the ground electrode and center electrode. The gap tool
should fit snugly at the recommended gap width indicated on the tool.
Push the tool between the electrodes a few times to ensure
proper gap. If the gap is too wide, push the ground electrode firmly
against a flat surface to narrow the gap and then check again with the
Repeat Step 5 as necessary until you reach the correct gap. Reseat the spark plug and reattach the spark plug wires
The recommended spark plug gap for a 2003-2004 Honda Odyssey is .044"
Keep in mind, many OE manufacturers (i.e. Denso, NGK) pre-gap their
plugs for specific applications. If you happen to buy the iridium or
platinum style plugs with the very thin center electrode, they should
come pre-gapped. It can't hurt to check the gap before installing
the plugs, but if any adjustment is necessary, do so with caution
because the ultra-thin electrode may crack if any excessive pressure is
placed on it.
Hope this is very helpful Best regards Michael