So do you think it is safe to say that replacing the brass gear with a 15 tooth count gear would fix my problem? Does the speedo that has 15 tooth gear have the same # of gears on the plastic shaft as pictured above?

You say you have a speedo from a 2:88 car and 3:07 car. Are the pot metal gears in both speedo's the same?

I hate to spend $29 on a gear only to find out it will not work.

__________________
AJ

1985 300D (SOLD)