B-414 engine and electric?

just bought a B-414.
It runs and drives, but I want to know
if anyone know what sort of engine-vent cap is on top of the engine? I think it"s also the the oil fill cap? Now, there"s a rubber hose on it that goes all the way down at the right side of the engine, this can"t be right?

The next thing I need to know is, does anyone have a wiring diagram for this tractor. There"s just not much original wire on it. the only thing that works is the dynamo; the starter, well a part of it seems to be wired correct. only there is a new wire directly from battery to the little switch on top of the starter.

Any help will be lighly appreciated.
Thanks

Well and for the wiring diagram, I don't really need it. I just need to know what switches are supposed to be in the dash. Wiring it correctly is that much of a problem if you can start from scratch.
I know that there's supposed to be a lightswitch (that one is still in the dash), But then they've put so many other switches on and under the dash,I just can't find out what's needed.
there's one pre-heat switch(key operated), an ignition switch (also key operated), the old lightswitch, a new pull-type lightswitch and a switch for the turn signals, and 2 pushswitches(don't know what they're for, are wired but nothing happens)

What did these old 414's have?
lightswitch
ignition/pre-heat switch (or are these separate)
startswitch is on the starter, it has the original "Lucas" starter

If someone can tell me what switches are needed, and how they look like, that would be great.

Maybe someone can take a picture from the dash and/or valve cover with the cap on top

Thanks

I allready knew that the hose wasn"t OEM.
But I need to know what goes on then, Do you have the IH part number; So maybe I can get the part at a local dealer.
For my electrical prob, I only need to know what switches are in the dash. Getting it wired that"s no problem at all. I just have no clue on what"s supposed to be there for ignition and glowing. Are there 2 separate switches?
or is it a combined ignition/glow switch?
I"ve rewired our 634 without a wiring diagram, just common sense and some logic thinking, but all the original switches were still there. Once I know what switches the B414 needs(to appear original), it"s just one afternoon, me, the tractor and some wire. :-D

guess I'll go hunting for the oil cap.
And get a new ign/glow switch.

C ya