I had a question PM'd to me on a blown application & I figured I'd address it here. I'm not a 2 stroke guru but I've spent a bunch of time messing with them, mine & others. I did my apprenticeship in New Zealand, have been racing all my adult life & earn my racing money doing 24hr breakdown service for long-haul trucks & tour buses here in the Rockies.
An EGT gauge should be considered as a "gauge", not as a safety valve because the engine & reading location's will vary per application as in turbo draw through, blow through or blown & the important thing is what's happening in the hole.
Reading the plugs is a must but I also read the pipe. I like to see the pipe wet just out of the head & that tells me it's not too lean in the hole. Once you have that, now you know how the plug should look & have the EGT number you can call good for your setup.
Draw through will tend to lean out as you go up & blow through will tend to go fat. EGT's will be a little higher with a turbo than a blower due to pressure stacking in the pipe.
To save unbolting the pipe a swillion times to see if it's still wet in there, I weld in a 1/8 pipe bung so I can pull the plug & stick my cheap (fine China Harbor Freight) bore scope in there. Looking at the end of the pyrometer probe was not good enough.
Hope this helps you 2 stroker's!
Now to get back to my 10.45 liter twin turbo 4 stroke.
Sid.
ps I sold my turbo sled to buy tires for my streamliner.