haaa haa haa.. sorry k5chris im usin the factory tach setup....
sorry this is long and confusing but that is how i work
my dual gas tanks used to work fine until one day the gas guage went from 1/2 tank to full and beyond. I switched tanks and that one worked so i figured the float went bad. then that tank did it too..... i took the wiring out from under the truck to check it out but got sidetracked and never got back to it......this is back in 1996 when my truck came off the road. now i am trying to get it to a driveability part and fix some of the stupid stuff.
now i bought a 1979 k35 parts truck with dual tanks and i took the wiring out of it... but seems that guy had problems too but the gas guage worked. he took the switch out..... anyhow i took the wiring out....
i know 1 wire goes to solenoid
1 wire goes to 1 tank
1 wire goes to other tank
1 blue wire is cut and i dont know where it goes
also i am using the dash guages from the parts truck due to seeing the gas guage working and saying 1/2 tank.... the guages from the parts truck has the factory tach and my truck has the big gas guage so i used the one with the factory tach.
when i took out the one with the tach i looked at the gas guage and figured on the harness pin 18 and 7 were jumped with a pink wire and from 18 to the switch..... when i put that guage cluster in my truck i looked at my harness so i could move the wires and they already were ??????
so this long story is asking 2 real questions...
#1 what is the blue wire that runs near the tanks for?
green goes to solenoid
brown goes to one tank
other brown goes to other tank
(i put a knot to remember which one goes where)
#2 when you replace a guage cluster that has the big gas guage with a guage cluster with the factory tach, what wires need to be moved to allow the gas guage to work.... or is it fine the way it is?
thanks and sorry for all the confusion