I just used a 10K NTC, soldered some very thin wires on it and pulled the whole thing through a nylon tube I bought at home depot.

The tube also acts as a dipstick on a 722.6

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

To make the regular dipstick easier to read ...if you have a really good and small drill ....
you might drill holes at the main places you want to check... some dipsticks have this... easy ' go no go' as to whether it covered the hole when dipped as compared to streaking on the side.
15 year old thread raised from the grave .... the oldest I have ever seen.....lol

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

How to check the trans fluid level Per Mercedes-Benz

Second post:
Speedo cable disconnected - transmission fluid leak.

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Nosce Te Ipsum "Know thyself"