🔧 Boost Monkey Spark Plug Gap Tool: 12mm & 14mm Threaded Plugs (Includes 14mm + Feeler Gauge) Review

Need a feeler gauge to adjust the gap. (A wire-type gap gauge is impractical.) One possible improvement would be to change the shape to round so the gauge can be held in a vise. This would make it easier to hold the sensor with your hands and turn the knob.

Required to obtain proper clearance for reliable operation of uprated engines. Background: My machine is out of stock and I need to close the gap 0.004" below standard. This tool + pen allows me to set the gap with surgical precision. Clearance is now fun and fast.

Fast delivery. The tool is made of aluminum alloy and the surface is black anodized. Also great processing. I bought a gap for 14mm spark plugs to fit my 2012 Toyota Tacoma V6. Gap adjustment is very easy with this tool and you will need a filler gauge. In my case I used 1.1mm. I highly recommend this seller.

I love how well made and thought through this product is! The top screw has a nice large grip area and makes bending the spark plug loop easier. Also, the part of the bolt that attaches to the spark plug loop is large and flat so it makes firm contact and doesn't contribute to side impact on the spark plug loop, keeping everything perfectly aligned.