That was the only one I found that was in reasonable price range. Either Ecklers or Mid-America have a plug and play set that plugs into the existing harness and requires no cutting. Price is approximately $180. Then I found this website and thought for $150 savings I'd give it a try.
On my 90, I mounted the module on the left side, attached to the back of the horn bracket. The brown wire on the socket goes to the parking lights, the blue wire goes to the actual turn signal. I got the ignition power source from the fan relays. A chassis ground is on the frame rail just to the right of the horn bracket. Again this is how it went on my 1990, check local listings if the same color code applies to your car.
Instructions are very clear, but if you have a problem, feel free to email me.