... I know this has been discussed because I've read it before on the forum, but not having any luck with search. I need to buy some wires to replace rotted ones on my 123's turn signal and can't recall what the conversion is from the measurements in the FSM to the AWG gauges. The wires in the manual are .75 and .5 mm^2 ... what gauge wire do I need for each? Sorry to ask this when I know someone's told me before. I need to stop at the store on the way to work and I'm sort of running out of time ...
Thanks. I promise I'll write it down this time.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)

google anyone?
http://www.engineeringtoolbox.com/awg-wire-gauge-d_731.html

Oh, Google ... guess I should have thought of that one. Sorry. Nonetheless, thank you.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)

also, be sure to use the wire larger than what you are replacing not smaller... as neither of the dimensions you list are a cross directly to awg.