Yes, even though you do not specify the front or rear bumper, both will fit. All d21 Nissan pickup trucks are referred to as "hardbody". They were manufactured, in the U.S., between 1986 and 1997. Most parts are interchangeable between the years, the only real difference is the bed length between the standard cab and extra cab, they are not interchangeable.
Yes
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A 1990 Nissan pickup truck has power steering. If the truck is displaying symptoms of not having power steering check the fluid levels and pump itself.
It'll fit, but it probably won't work very well, as a 1996 transmission would be wholly electronic, and the 1990 transmission would not.
Get a new brake pedal stop at the dealer, your's must be broken. It's just a plastic plug that goes in the brake pedal arm under the dash. It's only about three bucks.
The Nissan 4x4 pickup 2.3 was produced from the years 1990 to present in the United States. The spark plug gap on a 1986 Nissan 4x4 pickup 2.3 is .044.
underneath passenger side seat
In the ac box
Go to www.installdr.com .
your head gasket is probaly blown.
Probably not.
There is no OBD connection on a 1990 Nissan as that is an OBD1 vehicle not OBD2. However there is a way to read the codes. https://codes.rennacs.com/Petrol-Engine/Japanese-Korean/Nissan-Engines.php