Ok so I installed new gear. I greased just the tip of the cable into instrument cluster. No change. Cable was replaced with a new cable in 2012. So any suggestions would be appreciated.

The bronco cluster came with an amp gauge that you pass a wire thru the loop on it. I get that the starting point of this wire is at the solenoid where the battery connects. Since this a F100 and not a bronco where do I terminate the other end of this wire? thanks in advance for any help.

of course my confusion is the LMC truck sells two different gears. Looking at their catalog there is a physical difference.

the old cluster speedometer bounced as well but not as much as this one does.

Ok so let's say that the gear is messed up.
Replace it with f100 4speed gear or bronco 3speed gear?

I have. Speedometer needle jumps all over the place no mater what speed

I have recently installed a 1966 bronco instrument cluster into my 1966 f100. Question i have is do i need to change the speedometer gear? I have a 4-speed transmission. When I look at LMC truck they show that the bronco came with a 3-speed trans but I have a 4. So which gear should i use? any help ...