RamDiver
Senior Member
- Joined
- Jan 23, 2022
- Posts
- 5,727
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- Location
- Marlborough, Ontario Canada
- Ram Year
- 2021 DS
- Engine
- Hemi 5.7
Spark plug gap tools. It’s been a long time since I looked at spark plug, gapping tools. Someone said to avoid the coin type ones. Well, now I’m seeing all different different kinds of spark, plug gapping tools. There’s the round one with the metal rings. Now there’s all other kinds of gapping tools.
Any advice or recommendations?
The blade style has always been my preferred choice. I'm looking forward in seeing other's preferences and why.
These are easy to read the gap size, typically better quality, and you get lots of different angled surface areas to measure with. Any damage to the measurement surface will be more obvious than other styles.

The coin-style gap tools are often cheaply made with aluminum or other soft material that often becomes compromised and there isn't much space from one gap size to the next. I need a magnifying glass to read gap sizes.
Wire-type, again, is cheaply made and likely won't show damage resulting in a compromised measurement. And the sizing is a bit easier to read than coin-style but tougher than blade style. Likely requires reading glasses at minimum.
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