915 model nbr and speedo help please

[Hoghead]

I bought what was described as a rebuilt 1985, limited slip, 915 box sight unseen. Now that it has arrived in Thailand, I am not sure what I received

Stamped on the bottom of the box is:
915/6112 718 5747
What does this tell me?

Both flanges rotate in the same direction, so I am presuming a LSD - is this a valid assumption?

I do not see any sensor for the electric speedo and the only sensor is a switch on the nosecone. Is this a reverse switch?
Where does the speedo sensor go?

There is no lever arm on the clutch release shaft.
Does anyone have one, or what else can I use?
Machine work here is cheap, and I have bought the Aircooled.net hydraulic clutch kit only to find that it is LHD and will need a new MC bracket

What is so special about Swepco oil?
It is not available here and I was thinking of a synthetic gear oil

Thanks
Robert

[Turbo Haraune2]

The switch in front if for rewerse lights
If you cannot make the driveflanges turn opposite directions its a locking or lsd diff inside

[Hoghead]

I thought it is a reverse switch as it is plunger operated and simply on or off.

Where does the speedo sensor go?

Any input on my other questions would be greatly appreciated

Robert

[Wally]

Yes, its an original limited slip. I can tell by the model number
Please send it to me! :-)

[Hoghead]

I have researched the box code part of my question, IE
915 = 915 box
61 = 911 SC (ROW)
12 = LSD
718 = 1978
5747 = sequential box serial number

The big problem is that this should be an electric speedo box, but the speedo hole is plugged. The plug appears internal?? and not a simple frost plug type that I can easily pop. See pic:

I need an electric speedo output - any ideas or suggestions?

Robert

[Turbo Haraune2]

Autometer har a universal signal generator for speedo signal.
Gives out a square vave.
I use it coupled to the original speedo wire.