Bump....
Wow 3 days and 48 views with not one reply, first question post I've ever seen without a reply.
By any chance does anyone who has replaced the stock tank or removed the original speedo and added a drink holder (LOL) still have the stock speedo laying around? I'm 95% sure it's going to be a 3 3/8" gauge, but I used to work at an auto parts store and sometimes manufacturers would have their own size gauges (rare but still happens) I'd just hate to order a 3 3/8" Volt/Temp gauge then with the tank off reolize it's an oddball 3 1/4"