Code 42 OBD1 (1 Viewer)

[Viking1065]

Greetings all. Having a challenge with my 93 fjz80. She sat for 2 years and have swapped out many parts. Running very well until last Friday. OD light started flashing after work. Halfway home check engine light on and no speedo. Additionally had a hard shift into second. Took it to AAMCO. Trans solenoids were fine speed sensor tested fine. They indicated an electrical issue after the speed sensor. Any ideas appreciated