Get yourself a good nights sleep i.e B&B or hotel the night before, as you have such a short range get on google maps and find fuel points between the five main stops which you have to get a receipt to show the route the trick is don't faff around at fuel stops that 's where you lose time.
Carry a spare 5 ltr fuel can and use it that should give you 140 miles? that will make life easier make sure you start/finish with a full can so the amount matches the mileage, or get a bigger fuel tank on the old tassel tractor

Clothing.
You aint posing down the local cafe, good warm base layers water proof boots and outer clothing ie gore-tex spare gloves and neck tubes be warm and comfortable, this ride takes place near midsummer but at two AM in the north of Scotland at your lowest point will be cold.
Food.
avoid large meals as the body wants to rest and digest therefore you get sleepy so light snacks dried fruit & nuts breakfast bars try to avoid chocolate & coffee high burst of energy and a rapid fall off the peak, stay hydrated quick drink of water NOT energy drinks at every stop no reason to run low on water most fuel stops sell it.
When you get to the main stops get your self a hot drink and a hot snack treat yourself carry chewing gum keeps your mouth fresh or stop and clean your teeth it will perk you up.
Medication.
Take any prescription meds you have normally, paracetamol or ibuprofen for aches & pains you will get plenty.
Safety.
This is your ride look after No1 if you can't keep a constant speed on the long boring motorway bits start making stupid mistakes ie not doing your usual neat overtake forgetting your life saver or indicating stop for ten minutes walk around get the blood circulating and drink water have a snack clean your teeth nothing worst than having a gob like a Moroccan camel drivers flip flop

If it gets too bad just stop get a kip the ride can always be done next year.