Tach
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Tach
Well I wanted to add the factory tach to my truck, and I knew that the original printed circuit wasn't gonna work. I planned all along to make my own 3-wire harness to make it work with my 300 six. What I wasn't expecting, was the gauge cluster on mine has the electrical connector right in the middle of the back of the cluster, and there is no place for the tach to phisicaly go. It had the blank plate in the middle of the instrument cluster, but no recessed place for the tach to into. Because the electric connector is right behind, I can't even modify it to fit.....anyone allready know of this? Guess I'll have to get the whole white enclosure from the junkyard to make it work.
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Can someone tell me if there is a cluster out there that will allow me to have the factory tach + idot lights for oil and amps? I want the tach, but I don't want to redo all the wiring for real oil and amp gauges. If I have to, i'll move a few pins around in the harness in order to use the idot lights in a new cluster that had full gauges.
Heres the cluster I have now:
manual transmission/speedomter with trip (just added)/gas and temp gauges/oil and amps idots lights/no indentation where I can mount the tach
And what I would like:
All the above + the tach
Heres the cluster I have now:
manual transmission/speedomter with trip (just added)/gas and temp gauges/oil and amps idots lights/no indentation where I can mount the tach
And what I would like:
All the above + the tach
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
Unfortunately you cannot add a tach to Idiot light clusters.
Your only safe option for a factory tach, is to get the whole main dash harness and altenator harness out of another truck, then swap in a ammeter/oil pressure gauge cluster with tach. You could rewire your existing harness, but I do not recommend that at all. 13 seperate circuts have to be changed and rerouted, and the proper ammeter shunt placed in the circut, otherwise fires WILL result.
The cluster plastic, as you have seen is vastly different. The underdash wiring is also vastly different, as is the altenator wiring. The reason for the vast differences is so you cannot swap the cluster easily between gauges and idiot lamps. Not done right it WILL cause a electrical fire. If the proper shunt isn't used in the ammeter circut, full charging amps will go through the ammeter, and POOF up in flames. Hopefully I said fire and flames enough.
There is no way to mix a factory tach to a idiot lamp cluster, or to modify a gauge cluster for idiot lamps.
Another option is a aftermarket tach.
Your only safe option for a factory tach, is to get the whole main dash harness and altenator harness out of another truck, then swap in a ammeter/oil pressure gauge cluster with tach. You could rewire your existing harness, but I do not recommend that at all. 13 seperate circuts have to be changed and rerouted, and the proper ammeter shunt placed in the circut, otherwise fires WILL result.
The cluster plastic, as you have seen is vastly different. The underdash wiring is also vastly different, as is the altenator wiring. The reason for the vast differences is so you cannot swap the cluster easily between gauges and idiot lamps. Not done right it WILL cause a electrical fire. If the proper shunt isn't used in the ammeter circut, full charging amps will go through the ammeter, and POOF up in flames. Hopefully I said fire and flames enough.
There is no way to mix a factory tach to a idiot lamp cluster, or to modify a gauge cluster for idiot lamps.
Another option is a aftermarket tach.
