The temperature gauge seems to be straight voltmeter and easy to actuate with a little Arduino PWM Voltage out, the tach was harder, got no motion with voltage or pulses. Turns out tachs often assume wire to the ignition, a complicated approach.
SO I tore into the cluster and found a little board of electronics that seem to connect to a DC voltmeter for the tach. Snip snip, and into the breadboard we go!
The PWM (pulse-width-modulation) off the Arduino is a bit noisy, both the gauges hum a bit as they make their sweeps.
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