I just bought a new gauge cluster on eBay for my '71 FJ40. My original cluster is pretty worn out (lots of fading/scratching along with a non-working odometer) . The speedometer on the one I just bought reads in km/h but that doesn't bother me. I have been researching how to install it and have discovered some compatibility issues with these new clusters in older FJs. Apparently, a lot of it comes down to the amperage difference (50amp vs. 30amp). Can anyone shed some light in this for me? Is it an easy retrofit? Could I just take the ammeter (parts or whole) form my old cluster and put it in the new one? Thanks a lot.