Some thing s have changed and I dont know why.

I get 1.8v at the diagnostic port 1 (tach) and at pin 10 for the fuel pump relay now instead of 3.5 that I was getting.

The Idle speed solenoid is now sorta working. Its getting voltages nad is adjusting the idle speed but its a little erratic. Getting between 3.5 and 4.5 and its very jumpy.

I ohm'd out a bunch of wiring along the tach circuit and it appears to be intact.

I still cannot figure out why the fuel pump relay is not latching in and why its random on how long the car starts and runs with it in. The car will start and almost instantly quit sometimes and other times it will run for 10 or 15 seconds before the relay drops out.

1) If you can, post a picture of the TSZ that you have.
2) It is good that the TD circuit appears to be intact. The varying voltage in that circuit suggests that either the output of the TSZ is failing, OR there is one or more points of high resistance (loose or corroded connections) in the TD wiring, starting at the plug on the TSZ.