Intermittent Tachometer Dropout - Instrument Panel Ribbon Cable Cleaning

Electricalbeginner✓ Community Verified

Problem

Tachometer would randomly drop to zero while driving, then come back after hitting a bump or tapping the dashboard area.

Tachometer randomly drops to zero while drivingTachometer returns to normal after hitting a bumpTachometer returns to normal after tapping/punching dashboard areaIntermittent and unpredictable behavior

Root Cause

The ribbon cable connector behind the instrument panel had dented or compressed contacts, causing intermittent electrical connection. Corrosion buildup on the contacts from moisture and heat exposure further degraded the connection.

Confidence

High confidence — Multiple community members agreed on this solution

View Original Thread →Posted March 2025 on SupraForums.com