Tach dash cluster

[BLE 'BURBAN]

Originally Posted by Motor City GMC

I have an opportunity to get a stock tack dash cluster out of a 87 silverado, but my 87 gmc 1500 does not have this, anyone know if it will just plug in and everything work or if anything has to be done for the tach to work. I am assuming that everything else will only thing differetn between the two is the placement of the fuel gauge. Thanks to all.

One other question how does the tack work? what i mean is what does it plug into to get the rpm reading?

What year are you wanting to put it into?
'73 - '74 w/ pionts type dist & remote mounted coil hook the tach lead to the + side of the coil.CORRECTION- As pointed out by Mickey_D below that should be the - side of the coil.
'75 - '86 with coil-in-cap H.E.I. plug the tach lead into the dist cap where it's marked "TACH"
'87 - '91 models plug it into the white unused lead right near the coil. That is the tach lead from the coil.
Run the positive lead from the coil to a "switched" (no power when key is off)power lead on the fuse panel.
Run the ground lead to the 6 prong cluster ground located on the left side wall behind the cluster.
And here's what you will see on the back of your tach cluster where the tach leads are located...................