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Chuck, you can definitely just tap in the harness and ground it whenever you want the converter locked. Problem is sometimes (only sometimes and for some people) the PCM does not detect the converter unlocking when it commands it to (cause you have the switch on) and it goes nuts and throws the trans into limp mode. Again, this don't happen with everyone's truck, so by all means go ahead and run your setup, and if she ever goes into limp mode just disconnect the batteries and let the PCM reset itself. I have the resistor cause of how much stuff I got hooked up to my batteries, and I can't just go and reset the PCM every time it goes silly on me, and with my luck I just know that will happen abut every day I drive the thing, lol
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'90 F350 XLT Lariat, reg cab, dually, RWD, 4.10s, factory tow package, and lots of add-on goodies 
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