The Dwell/Tach is connected either across the points or the coil, depending on the design. The meter will read dwell in degrees and the points must be adjusted accordingly. The rpm setting will display rpm. The car probably has a CDI, Capacitive Discharge Ignition. There is not much current going through the points.
The alternator has a small current going through the field coil, or rotor. Turn the key on and look for the ALT light. It must be on. If not, replace the bulb and also check the small red wire on the back of the alternator. The alt. belt must also be properly tensioned. Check the battery for proper fluid level. The regulator may need to be checked. Use a voltmeter and test fhe voltage at the alternator large red lead. Also check the battery voltage.
Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor
Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL
ENTER > = (HP RPN)
Not part of the in-crowd since 1952.