Alright, where to begin....
The LEDs will in fact be constantly on, and therefore will not connect to the stock flashers. THis is where my bike takes an evil turn. I have LED 1156 bulbs (amber) in the rear flashers, in order for them to flash on my stock electrical/flashing system, I had to install a pair of flashing relays, one for each bulb that is an LED. This is required because the LEDs draw so little power that the system thinks that the bulb is dead, and wont flash unless it is fooled (or you buy one of the expensive aftermarket flasher units). My front 1157 bulbs are still stock incandesant, mainly because I have not bought more flasher relays for the LED 1157 that I will put in soon (they are comfy inside my 78 T-bird at the moment). I also have all LEDs in the speedo/tach/odometer. This is the easiest LED upgrade on your blike, as these bulbs do not need any relays at all, and instead of having 7 or 8 bulbs using 3.4 watts each, My LEDs draw around 300 milliwatts a peice. That is equivilant to less than one bulb. THis is not a dramatic improvement on total power savings, but it sure is nicer to have a 100,000 hour bulbe in the hard reach insturment cluster. AS for my newest LED job, I wanted to give myself some more visibility, especially at night, but without making so much ruckous that actual turn signals go unnoticed. My intention is to be noticed. I am using two clusters of hyper white LEDs, that are fused on to a circuit board about the size of a silver dollar. There are five Large LEDs on each unit, located on the outside rim of the board, facing upward (this will make sense when I get a picture loaded). When power (around 500 milliwatts minimum) is placed into the board, the five LEDs flash in a chasing pattern. But this is the best part, there is only ever one LED lit at any given time, and the chase is slow, such as the slowest chase pattern on X-mas lights. Perhaps the most comical aspect of the whole thing is where I got that LEDS. They are from a Gillete mach 3 turbo display box at a local Wal-Mart. The picture of the razor had lights flashing in a halo pattern around it, and when the product was no longer new, the employees were going to toss the whole display. With a little convincing, I got to rip out the LEDs, which were already connected to the circuit board. Haha. Oh, and Eldar, to answer your question. With a little research, you can buy individual LEDS and not spend a fortune. Or you can go the slightly more costly (and easy) route and buy LEDs that are installed on a bulb shaped unit that will fit a stock light base. You can really spend a lot of money on custom stuff, if that floats your boat. But in order to switch out signal front and back, and brake lights is you have 2 bulbs...... I would say between $120 and $250 respectivly. I swear, when the weather clears a bit I will begin work and fload you guys with pics! Until then, good day and good riding.