The defrosters are the default setting and will be enabled if NO Vacuum is present. You should feel air through the defrosters no matter what setting you have. Make sure you are getting vacuum to the vacuum diaphragm.
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That solenoid looks funny. The left wire on the big terminal (bolt) is the wire going to the starter, when engaged. It is NOT capable of the current required to start a diesel motor. It should be at least 8 ga or bigger.
You probable shorted the "trigger" for the starting to the solenoid. This is the wire that tells the solenoid to "start". It comes from the ignition switch "start" position and goes the solenoid. This goes nowhere else.
You want to be able to read the Exhaust Temperatures as the exhaust leaves the heads. This is the hottest temps you can read. Having the EGT sensor down around the crossover pipe is not the best representation for the EGTs.
If your engine has a lot of miles on it, the timing will jump around. This is due to the loose timing chain on the cam. Beside replacing the timing gears and chain, there is not a lot you can do about the timing jumping around. It will not harm the engine.
Y'all know these 'Screamin Gimmys are two stoke engines. They may not be legal to install in many states, like California. I owned a 9V92Ta in the 1980's. Fast truck until 2000, when they were outlawed in Calif. I raced my 10 wheel dump truck against many other trucks and won about half the...
Since your truck is 35 years old, you probably have cracked vacuum hoses or they have become loose and do NOT hold vacuum. Start here and see what you can find. Does the vacuum system hold a vacuum, at the can, for any time? Does the vacuum can leak?
You have never had nicotine addiction. It drags you to nicotine and won't stop without help. I have been addicted to nicotine and alcohol. It took a lot of will power and support to quit. I will NEVER go back to either.
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