This is honestly the single largest item stopping me from buying a new Colorado. I just can't get over how stupid they are to omit a dash light.
While to some it may seem like this is a ridiculous reason to not buy one of the Twins, and I speak as a 2WD owner, it makes sense to me.
If everytime you get in your truck you are going to worry about the status of your 4WD, then it will not be an enjoyable experience. Please go buy something else.
Sadly, I think you will find your other mid size truck options lacking.
*Frontier - a relic of antiquity.
*Tacoma - A relic with a fresh coat of paint. Toyota never allowed me to sit in a 2014 or 2015 Taco when I was shopping, but those seats look very uncomfortable.
*Ridgeline - There is a whole thread on this one, so I should leave it alone. Maybe it meets your needs.
Hang in there. Ford is bringing back the Ranger, Jeep a Wrangler-based truck. Maybe Nissan & Toyota will decide to move out of the stone age of mid-size trucks.
And who knows, maybe GM will re-design the instrument panel & dash on the Twins.
If I had to list the biggest failures on the design of the Twins, it would be this lack of a 4WD indicator and the performance of the 6 speed transmission with the V6. It appears they fixed one of these issues in 2017, maybe 2018 will resolve the other.