First cut the panel, then run a wiring diagram to identify all the sensor leads. Use a multimeter to isolate each signal – note voltage, frequency, and waveform. Once you have that, you can feed the analog outputs into a small microcontroller with ADC channels, then map those to the digital bus of the new dash. Keep the original harness intact for safety, and add a shielded cable to prevent interference. If the glitches come from old relays, replace them with modern equivalents. Just make sure to ground everything properly and test each circuit before sealing the panel back up.

Got it, I'll keep the bench run tight and log every pin. No shortcuts with the grounds – that phantom current is a real pain. And yeah, I'll make sure the shielded run stays separate from the main 12V to avoid frying fuses. I'll file everything up and send the pinout once the test rig is clean. Stay tuned.