First sorry for bringing repeatedly covered fuel starvation issue
I recently changed the fuel line ,and put in 1/4 inch fuel hoses and inline fuel filters on both reserve and ON line.
bike died on me when I was doing 85 with full tank of gas and fired up again when I changed the petcock to PRI position.I splutters to 100mph
Is this common fuel starvation associated with GS petcock or anything to do with  size of hose matter

and I am installing digital gear indicator on my 89'GS and which wire (coil/spark plug/ignitor) would I get pulse signal needed for tach

Manoj

You'd use the spark plug wire for pulse. Usually when I see people installing gear indicators they have to go in by the shifter. Otherwise your bike would know what rpm you're at, but not what gear. For the most part it could keep up by counting the rev jumps, but I'd think if your bike skipped a gear or something like that it'd start telling you the wrong gear.

As far as the fuel starvation... for future reference, you can just put one fuel filter on the line that goes from the petcock to the carb, instead of 2 before it. The PRI setting just comes through the reserve line, so if you had a filter on that one too, it'd most likely start doing it on pri as well if it's fuel starvation. If it runs fine on PRI then you know it's the vacuum petcock.

Did you check the flow of your lines with the filter in it? Sometimes filters don't let the gas flow fast enough and that causes you problems. Pull your lines off the petcocks, and drain some gas into a gas container and see how fast it flows, then pull the filters out and check again. If it's significantly faster without the filters I'd just run without them until you can get a better one.

can I use the yellow wire that runs from right plug connecting right left plug
and what sort of wire gauge should I use for draing the pulse
Manoj

Good questions. I keep the fire extinguisher around when I do something stupid like replacing a light switch in a wall, so I'm not the one to ask.

Hopefully someone who knows will come around.