gearbox and rear diff temp

[fazer600]

hi guys well its been ages since ive been here so firstly a big hi to everyone.
im sort of in the process of doing some mods on my paj and need a rough idea as to the operating temperatures of the manual gearbox oil and the rear diff oil.

i dont really want to buy a gauge that starts off at 50 degrees when the oil is actually operating at 20....! if you see what i mean.

im planning to get some temp senders sorted so i can have 3 gauges in the car.
1 for the engine oil
1 for the gearbox oil
and 1 maybe for the rear diff.

so if anyone has a rough idea as to what sort of temperature the gearbox and rear diff oh and the engine oil operate at that would be great......
cheers
fazer 600
aka the original dial man...... ah thank you lockwoods.....