Instrument Cluster Questions.

You can use 194 bulbs but some guys have used LED replacement 194's.

The odds are you have a bad ground on the instrument panel. You will have remove the instrument cluster to check the connections.

See http://www.stangnet.com/tech/cluster87-93.pdf for a diagram of the instrument cluster wiring. Double check the pin description I posted below against the drawing above.

With the instrument cluster removed and sitting in your lap, there are two connectors for the dash wiring. Your point of interest is the outside set of contacts on the vertical connector. The second copper foil trace by the voltmeter is the ground. The 12 volt feed is the 4th contact. Check both the copper foil and the wiring connector for damage.
With the ignition switch OFF, check the resistance between the wiring connector ground contact and body ground. You should see less than 1 ohm.
With the ignition switch ON, check for 12 volts on the wiring connector 12 volt contact.

Def check grounds, I believe the ground for the cluster is on the drivers side fender, either the one near the battery or on the forward side of the driver's side wheel well. Check/clean both...think about adding/upgrading ground wires, fixed a lot of problems on my car

Tach removal

Wiring diagrams/ground locations

Have fun.

Jace78 said:

Tach removal

Wiring diagrams/ground locations

Have fun.

Click to expand...

Excellent additions to the help notes....