I believe all the stand alone computers come with the necessary wiring, I'm going with Optishift Quick 1 for my 4L80E, not the cheapest, but excellent warranty and features, including a selectable display that can show the gear selected, will do the 4L60 and the other members of the 'family' .... and FlamingRiver has an OD indicator

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics