Blue - if you got one for yer year, it's 12v - all TF are 12v, gauge and sender - where did you get the replacement gauge, new or used? I'd suspect that, but an ohm meter will check that the sender works
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics