OK...I FINALLY got a working combination with the LEDs! It took a bit of fiddling, trying different combinations of flashers, but I got a combination that works!
So, at least for my '89, leave the stock silver one in place on the fuse block and use the one that shelbyone suggested above in place of the yellow flasher that is tucked up under the dash. I tied the ground in with the common ground down by the driver's left foot. It works as advertised! I do like the way the LED bulbs light up the housing. It has a much more even "warmth" to it and of course it is instant.
That makes the last things to fix on the car are the A/C lines and the transmission (3/4 synchro is SHOT, but it can still drive fine...spare will be going in).
This passed Friday I cruised home, top down, Pandora playing and the map application running through Blue Tooth...it was beautiful!
I got an invitation to a local car club that has 2 TC's in it. One is a red '91 owned by Bill Sheffer, whom I have tried to reach out to, and I am unsure of the other. I can't make their monthly meet up in October due to work unfortunately. There's a show this coming weekend I am going to try to go to as well. We shall see!