On my Shadow it is behind the seat.
horsepower rating specifications for 1983 Honda vt 500c shadow
404 lbsd
The fuse box on a Honda Shadow 500 is located under the seat in a water tight compartment. This provides protection to the delicate electronics during all types of weather conditions.
Any antifreeze that will not hurt aluminum.
30 Straight weight
130/90x16 rear and 100/90x18 front
it should be printed on the side wall of the tire Front 28psi Rear 30psi Add 2psi (32psi) if load is over 300lbs/ can reduce to 28psi if rider is under 150lbs
Hopefully just a valve lash adjustment.
2.5 liters
2.5 liters or 2.6 US qarts.
There are four spark plugs in this bike's engine as it has a four cylinder V.
Depends on the make of the tire but generally 28 psi front, 36 psi rear.