Instrument cluster wiring.

[Spectre]

2 part question

So I'm looking at this diagram http://fordification.com/tech/wiring/68-09.jpg

I want to do a custom autometer dash and what not but it won't be for awhile.. So I'm deciding if I want to make the 69's cluster work with my 87's harness for a much cleaner look..

So on the back of the cluster is a box. From other diagrams It shows it being a "constant power source" 3 connections on it.

1 goes to ground,
1 goes to power when the key is in the ACC and RUN position.
1 goes to all the gauges (except the oil preassure gauge) That shares with the main power wire..

So what does that I'm trying to figure out if I should just run a constant power there from the harness and keep it like it is or tie each gauge to the power wire in the 87's harness..

Also per this diagram http://fordification.com/tech/wiring/68-23.jpg

There is no ground wires on the indicator lamps.. Does it just use the cluster itself for ground like the tailights do? So basically I would run a ground wire and attach it to the cluster? Or does the "constant power source" ground lead serve as the ground for the signals as well?

Hope that makes sense.. Thanks!

[fordman]

the little box is a voltage regulator. it regulates power to each gauge. you have to use the regulator to run the gauges properly.

[Spectre]

k.. So my constant power should go to the regulator.

I'm still pondering it.. nothing is set in stone yet.

[fordman]

yes power comes from the fuse box and ignition switch to the regulator then to the gauges.