1990 sw20 mechanical speedo sensor

What is the exact bit you need?
The '90 models have a mechanical speedo but the later ones are electrical.
That $400 quote sounds like it may be for an electrical sensor.
 
You would need to get the correct part number for your model for the actual bit you need  from Toyodiy.
http://www.toyodiy.com/pa...2_SW20-AJMZZ_3304.html
 
Then check out: 
http://www.lithiatoyotapa...ndex.cfm?siteid=215542
They have great prices and service.
 
 

That link doesn't get me to the right page.
I have found the Lithia Toyota website site is generally too hard to navigate unless you already have the correct part number.
Did you first check out the Toyodiy website, and could you locate the part number from the diagram for your model for the actual bit you need?
"My plastic gear and the 90 degree connector broken"
If we are we talking about the driven plastic gear at the gearbox end of the cable, the link below gives the details for your model.
http://www.toyodiy.com/pa...2_SW20-AJMZZ_3304.html

found it
thank you!