[GNeric]

If you want to save yourself the $95, do like I do when I build one for non computer use. I run a 1 amp fuse from Key On source at the fuse block to "A" pin on connector to the positive side of the solenoid. Run the negative side of the solenoid to the 4th pressure switch and it will lockup automatically in 4th. You can interupt the ground side and add your own switch to ground and make it lock up when you want. Solenoid receives 2nd gear oil and has the capability to lockup at that time. Never had any problems in the last 20 years building them like this and I just don't lockup the stock type converters at WOT with this set up.