5ive-T conversion question??

[millzee]

I have bought a 5ive-t and as much as I love driving this thing as a gasser, my wife hates it more than the others, my son's run as far as they can and I have a hard time not driving it out of the backyard to go for a walk, it's bloody heavy to carry across the road, lol.
I've been reading up all day thinking I'd like to try fitting a neu 22series motor in so I won't have heat issues on long bush walks and trying to run it on 8s through a castle XL2, will this motor be too much for the speedo? I'd hope to go this way as I just can't bring myself to spend $700 on a mgm speedo unless it's a given that the xl2 won't handle it. Thanks to jony nitro I now know the rcm mount will work so thats helped a tone, cheers and great build. One more question is what rpm range am I shooting for with this truck with my goal being decent speed and not sacrificing too much runtime. I wouldn't suppose anyone might know if the skopod mount with the rear support would fit a 2220-25?