On my 90 the tach wire was already there. I cut it loose from the connector and used it to fire my aftermarket tach. Worked fine until I must have pulled it apart in the dash. To get to it I have to take the cage out so I rewired it to the tach test connector under the hood.


David Fritzsche
1990 Ex-Cab V-6,5-speed, with a few mods
04.5 CTD Dodge 2500 Ram--Tow Rig
Roseville, CA

"Serenity through Sobriety"