it seems you can get 50 amps for your truck ?

https://www.ebay.com/itm/NOS-MOPAR-1962-1963-1964-1965-1966-1967-1968-1969-DODGE-TRUCK-AMMETER-GAUGE/262419279071?epid=1329984388&hash=item3d19686cdf:g:QZoAAOSwS7hXAToY&vxp=mtr

I reafirm you don't need more than 50 amps in dash, since the batt will never suck that load to be recharged. Chemicals doesn't work so fast

With a Charger born in Chrysler assembly plant in Valencia, Venezuela