92 isuzu rodeo v-6 5speed, engine light on and speedometer dont work, why? does anyone have a picture of what the speed sensor looks like?

Here are some issues of Not working Speedometer*

1. The Drive cable is disconnected to a set of gears attached to the transmission,
**Common speedometer problems. **
-Faulty sensor
-Bad wiring
-Dial malfunctions.

I may suggest to replace speed sensor or drive cable

I suspect that the TCM is playing up but without a proper code reading it is difficult to say. Why do you not take it to autozone as they do scanning for nothing.

IAC - idle air control valve . What are the fuel trims at ? Are they with in + or - 10% short term an long fuel trims ? Do you know what fuel trims are ? What's the IAC counts at looking at scan tool data ? Or are you just guessing to find a fix ?
007 Idle Speed Problems Scan Data for Idle
Hooking up a professional type scan tool an viewing scan data is the proper way to diagnose these type problems . Your dealing with a computer .

Replace the speedometer gear.

because the drive ratios are different

You need to replace the speedometer gear that drives the sensor.

Replace the speed sensor located on the transmission this sends the signal to the speedometer, you may want to check the plug and its terminals to be sure the terminals in the plug are not corroded if they are clean the terminals with electrical contact cleaner then drive the care see if cleaning the plug fixed it if not replace the speed sensor.

Hi, I have a trooper also, I am pretty sure if it has a speed sensor it would ;located on the transmission near the tailshaft. Not sure that will help, but mine is a standard, so I can't look for you.
or the transfer case maybe?

You need to replace the speedometer gear that drives the sensor.

i think near rear of trans near output shaft