Installation of EGT sensors on 912ULS

Wow! That's one very tight set up

I would think that having the EGT probe's between the exhaust springs, will make them vulnerable to damage when you/your mechanic have to do work on the exhaust /muffler. So I would be putting them in the front exhaust pipes.

Be very careful with the final location/think ahead - Due to cowling restrictions/ pipe shape, I made oil filter replacement unnecessarily difficult.

Here are images of the front exhaust pipes. As you can see.. lots of room.

Another question - the diameter of the sensor is 5mm. What drill bit do I use? I can't seem to find a 5mm drill bit locally which is odd

In Australia it is getting increasingly difficult to find imperial drill bits.

I don't work well in imperial, the direct conversion from 5mm is  13/64 - should do the trick.

When I did this job some years back, I very slightly countersunk the 5mm hole and used a smear of anti size on the probe to assist in good seating. I also used the anti size on the hose clamp worm drive, to facilitate later removal (the oil burns off but the nickle or copper remains)

Actually, 8mm = (8*25.4) = 0.31496"
13/64 = 0.203125
5/16 = 0.3125
21/64 = 0.328125

So, 5/16 or 21/64 would work or be very close
Wow that bachelors in Mathematics is really paying off now lol

My apologies. Google (or my entry data) has lead me astray - As I said imperial (the Devil system) is almost a foreign language to me.