I can answer some questions for you.
Speedo cables are easily available, bit check that it just hasn't come loose at the back of the speedo. you don't even need to open up the dash if you don't want to, you can push the cable from the engine bay against the firewall.
Four wheel drive is engaged by pushing down the yellow lever, pull the red one back for low range (yellow one should pop up) and the red one back forward to go back to 2wd.
I don't know about speed per say, but i've driven my series 3 in padocks and around a farm in 4wd up to probably 60 with no prblems. it's when there is too much grip and you are turning corners that you will have problems.
engaging 4wd can be dne at a slow speed, but is best at a stop, and low range is a stop as well essentially. it can be done, but it's not worth the effort in my opinion. Others may disagree.
No 4wd engaged signals at all, but you will usually hear a difference in the gearbox.
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