luke: all good info given to you but a few things to be aware of:
1. when you turn key on, then turn run switch(red switch right handlebar control pod) you must let the dash lights cycle thru. the light with the V-twin logo in it must cycle and turn off. oil pressure light should extinguish after 1-2 seconds following normal start-up.
2. oil level always checked with engine up to temp and rear swingarm warm...like after a nice ride. and checked on sidestand and level surface. level must be within low/high marks on stock dipstick cap.
3. these motors generate approx. 10psi per 1000rpm operating range with 20-50 wt. oil at 70 degrees F air temp. anything above or below those #'s not normal.
4. do NOT...i repeat...do NOT ride or run it with low oil pressure light illuminated. not knowing its history or service records i strongly advise dumping trans/primary oil and engine/swingarm oil. both have identical 5/8th O-ringed drain bolts. remove both, let drain for an hour, remove cowling (7 torx screws) and remove filter. a 2007 and up 1.5L toyota yaris/scion filter fits. crapmart has them for $4. trans/primary holds 1 quart of 20/50 motorcycle specific oil (i love amsoil in there), and engine holds 2.5 quarts with filter change. i like castrol act-evo or any quality 20-50 oil. CHANGE BOTH OF THEM then see how your pressure is. hope this info. helps.