Welcome ....
Which year CTD did you own, and why did you switch?
Did you change the Allison spin on ?? If not you should, retain ring magnet on top of filter reuse after wiping clean ....
Air Filter, There are many types as you know the Uni filter seems very popular .... I haven't tried one yet,but available here at a good price as of late ....
Fuel Filters, The stock filter is Racor .... Do some research here on secondary "need of" additional filtering .... The OE catches sticks and stones and is rated at 5 um I believe but is less then adequate ... To go post or pre is your option .... To go with a Cat,Racor,Stranadyne ,Mega also is your own preference and with testimonials here ....
Gauges, same as you've seen in the Cummins world .... There are articles here on installs ....
lubricants, I'm on a Mobil kick right now bumper to bumper .... Synthetic except for the tranny .... Again the choice is always yours there are some excellent brands on the market today ....
ETC.... Absorb that and well get into POWER mod if you so desire ....
Mac