The map sensor is located on the fire wall towards the passenger side right under the wind shield.
in the distributor
You can find a 1990 Honda Civic SI wiring diagram in the car's owner's manual. You can also check with local auto stores.
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In the intake manifold plenium, its a 2 wire sensor
above the cataylic converter
On a Prelude 91 Si, you can find the MAP sensor by looking at the black box which is mounted on the passenger side firewall. You should see vacuum lines that run to it.
The speed sensor is what sends signals to the speedometer to display how fast a car is traveling. To find it on a 1990 Honda Crx Si it will be mounted on top of the transmission housing.
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It will be in the ducting before the throtle body.
Unfortunately no. Even the higher LX, EX and Si trims were non-vtec in 1990. Here in the US market, the first models to feature vtec were the 91 NSX, the 91 Integra GSR, and the 92 Civic Si. In Japan, there was a 1990 Civic that had vtec, the Civic SiR and Civic Special Edition. In Some other markets there was a similar model, the Vti/Vti-R.
On/by the Throttle body, should read "sensor assy map"