Bro just take the bolt out of the speedo cable where it bolts onto the gearbox, then pull the cable out of the box. It will have a small toothed wheel on the end of it, this wheel is your dipstick. Make sure the oil level goes to the top of the wheel and then your good.
You don't need to buy any special equipment it's completely un-nessasery, simply use a small funnel, bit of pipe or use a small oil bottle that you can manuver down there.
Just incase you aren't sure how to pull out the speedo, don't yank the cable, you will see that there is an oval shaped metal plate at the end of the cable (the bit that the bolt goes through), lift it from here, you may need to jiggle it from side to side a bit and then it'll just pop out.
Just make sure you don't over tighten the bolt when you put it back in of you'll nakker the threads on the box, just hand tight with a socket will do.