Lockup 904 question

oldkimmer said

U could maybe delay the l u function in the valve body. Or do u want it to work on your command? Is it hydraulic or electric l u?

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It is hydraulic control. I know about the electrric control, but I have never seen one. I have several LU 904's core transmissions, but they are all hydraulic. Even my 88 diplomat. It has the wire for the electric LU, but no connector on the trans, and the LU works. It is the original trans in the car. I bought it new in 1988.
I would like to manually control the LU function.
PS: I don't have a problem with going inside the trans to modify the VB or even adding a solenoid if necessary. The trans will be apart for a build, anyway.