what size adaptor do i need for spark plug autolite AP63 ?

It would be a good idea if you supplied the thread size on the spark plug you need info on, if you did that I could answer your question.

Using a digital caliper, i measured the threaded portion of the spark plug and got a reading of 13.80mm. do i use the 14mm size colortune kit?

I would have to say yes you are correct, but I better add that just in case it is not you should check the thread pitch with guages or your caliper. Coarse thread is 2mm pitch and fine is 1.5mm fine. If you need any more info I'll check mine

Will this tool work on a 72 Porsche engine. Or do I need adapters

I used it for 25 years on a '71 VW Super Beetle with the standard 1600 engine. It works like a charm. Mine was bought in the 80s from an adv. in Hot VWs. I still have the shipping bag with the nice black box. 'Never let me down.

Will this work for a 70 gmc jimmy strait 6 2barrel carb , thanks.

I use this on my Mopar V8 440 from a '68 Chrysler 300. The 14mm thread. i recommend loosening up the plugs when the engine is cold and then (anti-seize) them back in not too tight. You could do all 8, but, for me, I am fine with just two on each side of my split plenum intake. ( If you have a split plenum design, check your runners on your intake so that you are really reading two from each carb side. Pretty funny if you happen to pick all four from the same carb circuit! For example, on RB engines, 3 and 5, 1 and 7, or 4 and 6, 1 and 8 are matched sides for a 4-barrel. So, 1 and 3, or, 2 and 4 would work fine.) Keep in mind the hot exhaust manifold/headers, so, pick the plugs you can get in without burning your fingers and heating up your plastic pipe (Gunson). After your engine is warmed up and you have done your vacuum or rev range or even AFR idle, etc., switch out the plug for the Gunson. If you can, wrap the plastic in the 1" DEI or similar heatshield. I used the Firesleeve. This will protect the flimsy black plastic. And, when done - don't take too long running the engine - take off the plastic parts and plug. Don't let heat soak kill your piece.

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🔍 Tune In to Perfection!

PRECISION FIT - Designed for most vehicles with M14 threaded plugs, ensuring compatibility.
LIGHTWEIGHT DESIGN - Weighing only 150g, it's easy to handle and store.
VERSATILE ADAPTORS - Extra adaptor sizes available separately for tailored applications.
COMPLETE KIT OPTIONS - Explore additional Colortune kits with various plug sizes for all your needs.
USER FRIENDLY INSTRUCTIONS - Comes complete with easy-to-follow instructions for hassle-free use.

The Gunson G4074 Colortune Single Plug Kit is an essential automotive tool designed for precision tuning. It includes a 14mm short reach plug and a hexagonal adaptor, making it compatible with most vehicles equipped with M14 threaded plugs. The kit is lightweight at 150g and comes with user-friendly instructions, ensuring a seamless experience. Additional adaptors are available separately, allowing for versatile applications.

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€ 871.39

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Manufacturer	Tool Connection (EU)
Brand	GUNSON
Model	G4074
Product Dimensions	3 x 11.5 x 16.5 cm; 150 g
Item model number	G4074
Manufacturer Part Number	G4074
Item Weight	150 g

GUNSONG4074 Colortune Single Plug Kit 14mm

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