At the risk of stating the obvious, are you sure it needs to be replaced? 99% of the time the it's simply the sensor ground to the chassis that needs to be restored as per...
https://www.corvetteforum.com/articl...990-corvettes/
The 1990 sensor can be tricky to find as it's a one year only piece, although valid for the base and the ZR-1 corvettes that year.
Good luck...
H