I am using a universial speedometer with a tripometer that I traded a set of HD buckhorn bars for. In order to mount the speedo on the handlebars I purchased a 10" cable extension from
www.workingclasschopper.com Now I hope to have the flexiblity to mount a bigger gas tank something along the lines of a one piece 3.5 gallons and up tank like a HD FX, I have also looked to see if the M50 Boulevard, Intruder, Marauder tanks might work. If any of these tanks are off fuel injected bikes then they might not work.
I noticed a 3.5 gal fatbob/quickbob tank on cyclewarehouse website that looks to be close to 6" wide which is needed to mount on the stock LS650/C40 frame that starts out single tube for 5.5" then Y's to 6" for 10" to the rear tank mount. I posted some additional comments in the Michael P. Plan
Regards from Alaska