Coolant is clean green. I put an Egr delete kit on and discovered a small hole in the small over flow to radiator hose.I replaced that and so far there's no leaking. My instrument display still says low coolent level. Any thoughts on that?

green? is that dex cool rated coolant?

what about the reservior cap, pull it off and look at it see if its dirty

coolant should definitely not be green, should be bright orange:s:

What if the sensor under the surge tank is broken or unplugged?

Slobber tube had a little blowby, did some towing and it went almost to zero, rings sealed. I love this truck.