Engine check light on 1994 Trooper

I have a 1994 Isuzu Trooper with 203K miles. The “check engine” light came on today, with the speedometer/odometer not working, and a tendency to stall when braking to a stop (starts up right away). All connected, or several problems? I love this truck, but it is starting to show its age

Here’s how to pull the codes from the computer on your Isuzu. http://www.extreme-check-engine-light-codes.com/Isuzu%20OBD1%20Decoder.htm This will point you in the direction of the problem.

Tester