mid 60's mustang gastanks

im thinking of running one on my 50 poncho and im wondering wat gauge can i use? how are you guys venting them

 

You can run any gas gage you want...I drilled a hole with a hole saw to run a autometer sending unit with my stock 58 ford gas guage when I did my ol truck. Use hardline to run a vent off the factory filler neck(weld it on if its a new tank...or be very careful)...just get it out of the trunk.