Check engine error codes
 

I have a 93 4Runner that the check engine light has come on. I got a code scanner and was able to pull the following error codes. DTC 42 Vechile speed senor, DTC 43 Starter Signal, and DTC52 Knock sensor signal. Was wondering if anyone had any ideas what may be causing the problem. Seems odd that all 3 thing would go out at the same time. Was thinking it might have something to do with the wiring. Any ideas or suggestion would be very helpful.