Try a search on Pactra trim tape. I pretty sure most hobby shops would stock it (typically around $12ish) I have been using this for quite a few years now and have found it pretty easy to work with. I comes in quite a few colors (oddly, NO green). For green applications, I've used the white and a few passes with a Sharpie. Good luck on your search.
1977ish, AMT Movin' On Kenworth. Think I paid around $7- for it from a mom-n-pop hobby store (Herman's Hobbies on Dewey Av). Paint, decals, and overall construction is what you'd expect (brush lines, crooked stripes and half of the pieces not even taken off the sprue). But I'd be willing to bet, I logged more (1/25th scale) miles than Will and Sonny did on theirs and had maybe 100 times more adventures with that beast. , and I know for a fact, there are still some parts from her kicking around the parts bin as well. For the record, my son and I built two models together (Lindberg snap/promo style Crown Vic police cars), the first one is safely locked up in the man-cave" and the other he's pretty much demolished in any number of high speed pursuits but isn't that what its all about? Great memories, thanks for sending me back there Mike.
I think its good to revisit topics from time to time Tom. Here's my recent attempts, starting with what most would probably consider the industry standard. 1) Speaker wire from Radio Shack( the 3-pack of red, black and green). The stuff will hold a coil, but I feel it doesn't have the right "lay" to it aft of the pogo stick, more so that it is rigid and does not have a natural droop or drape to it. 2) The RS speaker wire again. This time, just the outer casing. This is great for the old-school, straight airlines but again, the stuff has a memory (from being on the spool) so it also lacks that "draped" look coming off the stick (maybe warming it and re-working it to the right shape, haven't tried that yet). 3) Telephone wire: this stuff is thinner in gauge and will hold a nice tight coil but looks a bit small in diameter. 4) Ear bud wire: Has a good diameter and seems to have a decent drape (in longer lengths) but is probably one of the more expensive options ($ versus usable length). 5) Paracord: This stuff is pretty cheap, looks the right diameter and comes in every color you could possibly think of plus three more. The only problem is it looks more like a fabric covered hose (I'd guestimate around 5/8" in 1:1 as I tried out as a 1" booster line on a fire truck reel and it came off looking too small).
Edit: I assumed we are talking the service hoses and glad hands
My conclusion, I tend to go with option #2, using the black wire casing (seems easiest to remove from the wire) and make three, old-school, straight lines, great for our older stuff but probably not what we're wanting for the more modern IH's and Petes.