Depends on what type of plug from NGK youd like. I have a link below you can use just enter your year make model and engine size, do a search on NGK spark plugs and it will show you all the different types of plugs. Click the link Below " Auto Parts"
They are right there on the top of the engine.
yes
does a 1990 honda prelude 2.0 s.i have a pilot bearing
http://www.modifiedlife.com/1990-honda-prelude-car-radio-stereo-wiring-diagram/
No, the third and fourth generation are a different Chassis.
6.5"
no
NO, they have two completely different motors.
show me picture of where the water pump is located on 1991 Honda prelude si
8 spark plugs
the fuel rail
It's hard to say, as the question didn't specify what kind of solenoid are you attempting to fit, and the 1990 Prelude had a mid-cycle refresh which included an improved motor.