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 your ride like a pro — see the burn, own the road!

PRECISION 14 MM FIT - Designed for a perfect fit in classic and modern gasoline/LPG engines for reliable readings.
LIGHTWEIGHT DURABLE - Compact 150g design built to last through countless tune-ups and road tests.
UNIVERSAL COMPATIBILITY - Works seamlessly with 2 & 4-stroke engines, carburetors, and fuel injection systems.
OPTIMIZE FUEL EFFICIENCY - Adjust your fuel/air mix precisely to boost performance and reduce emissions.
SEE YOUR ENGINES HEARTBEAT - Instantly visualize combustion quality with the original color-coded tuning plug.

The Gunson G4074 Colortune 14mm Single Plug Kit is a high-quality, precision-engineered tool that allows professional and enthusiast mechanics to visually assess and adjust the fuel/air mixture in gasoline and LPG engines. Compatible with various engine types and carburetion systems, it provides instant color-coded feedback from the combustion chamber, enabling optimized engine tuning for enhanced performance and efficiency.

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Manufacturer	SC Parts Group
Brand	Gunson
Model	G4074
Product Dimensions	3 x 11.5 x 16.5 cm; 150 g
Item model number	G4074
Is Discontinued By Manufacturer	No
Item Dimensions L x W x H	30 x 115 x 165 mm
Item Weight	150 g

GUNSON G4074 Colortune シングルプラグキット 14mm

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