This information was on a website I found years ago and saved, the original website is no longer available so I am copying and pasting the info here, I hope there are no copyright issues.  The original page was named Fire Pinto.

I also take no responsibility for the information that is on this page, use it at your own risk.

Sequential Turn Signals
STS Parts List & Tips

These are the parts that I have used (or will use) to build this system. All of the parts I got from Radio Shack, if any one knows of another source for relays at a good cost let me know. The Brand of the relays I used are OEG. I'm not too familar with this brand but they seem like they will be pretty reliable. Another Brand of relays I have always heard good remarks on, are Bosch. Though I don't know what kind of selection they have available.

DPDT Relays (Double Pole Double Throw)

OEG Part # OMI-SS-212D 12VDC coil, Contacts rated @ 5A 250VAC / 28VDC
I used these on my first "prototype", They are smaller blue colored relays with thin wire posts for mounting on a printed curciut board. You can solder wires directly to them, but if you use 16 AWG wire they could break off if bent.

OEG Part # SRE-202D 12VDC coil, Contacts rated @ 5A 240VAC / 28VDC
I am switching to these for my next one because the case is clear. I like to see what is going on, and it just makes trouble shooting alot easier. Plus the posts are alot easier to solder wire to. One disadvantage is that they are bigger than the blue ones, they share the same case as the 4PDT relays. They just left out 2 contacts.

4PDT Relays (Four Pole Double Throw)

OEG Part # SRE-402D 12VDC coil, Contacts rated @ 5A 240VAC / 28VDC
OEG Part # SRE-402DP 12VDC coil, Contacts rated @ 5A 240VAC / 28VDC
Use the top one if you are going to solder wires to the posts. The bottom one is for mounting on a printed curciut board, which I haven't decided if I'm going to try yet. :-)

Diodes

Radio Shack Brand 1NT4742A 12V Zener Diode, 1 Watt. Cat. No. 276-563A
These I picked up at the local Radio Shack. Not sure which # you would need to order from, so I put down both. Pretty much any diode would do.

Wire

I would use 16 AWG wire or bigger for the heavy draw sections of the curciut. I used 18 AWG on my first one, and you could tell that the outside bulb was just a hair dimmer. The wires that go to the hazard and the turn signal flasher, and the green wires that go to the Main trigger relay contacts can be a smaller gauge. They are only supplying power to relay coils. I used 22 AWG.

Light Bulb Sockets

Depending on what vehicle you have, you may have to replace a single filament bulb with a dual filament one. On a 87-88 T-bird you will have to replace the inner most ones. This takes a little bit of some handcrafting with a file, drill, dremel, or what ever else you can think of to use to make the hole in the lense fit a dual filament socket. Start by only taking out a little at a time, and trial fit the socket every so often to see where you need to file next.
I picked up some sockets at the local auto store, they had the same screw in design as my original T-bird ones, but didn't have the same blade-type bulb design. If I did it over again I would get them from that old smashed up T-bird in the junk yard I visit so much! I have seen some -one size fits all- sockets at the auto parts stores that would just snap in to a round hole, if you don't feel like filing the pattern for screw in ones. A round hole is much easier to make and broken tail lights aren't cheap to replace!

Flashers

I use an electronic flasher, it stays more consistent than the thermal ones. Thermal flashers speed up in cold weather and slow down in warm. Since this system uses the flasher as the "timer" it should stay consistent. The model I used for my 88 T-bird is an Ideal 752 this should work for most Fords for turn signals and hazards. I don't have an electronic one for my hazards, mainly because I hardly use them, and it still looks fine. I would get one for the turn signals for sure though, they are worth it for any car in my opinion. They last longer and don't speed up when a trailer is connected.
 

3 Bulb Sequentials with intergrated brake lights (Pdf. file)
 

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