I'd be very leary of your Ammeter wire, they are prone to shorting and melting at the bulkhead connector and the gauge cluster. Typically these connections corrode with time and humidity. I'd HIGHLY suggest a new reproduction wire harness (year One sells M&H replacements, very nice). Yes, expensive and a PIA to install but worth it, you may be saving your cars life, probably the #1 reason for dash fires.
