James, if you are looking at a particular helicopter with that avionics package you can rest assured that they are fine, quality, top-of-the-line products that will most likely give you years of trouble-free service. They're just a little old. Technology has moved on and there are some incredibly capable products on the market now. The aforementioned Garmin 430 and 530 are tremendous in what they can provide in a single unit. However, the lack of such equipment should not queer the deal.
In the light helicopter range (R-22, Enstrom) it might be rare to find an electric turn indicator. It's really not that important for day-VFR flying. In fact, new Bell 206's come from the factory without them, unless you order the optional "flight instrument group." More important is a slip indicator, which every helicopter should have. As has been noted, it could be something as simple as a piece of yarn mounted on the nose.