Tachometer problem

[CamaroAdam73]

Alrighy guys i'm having allot of trouble determining which wire is for my tach, i installed a brand new HEI dist and i need to pickout my tach wire so i can hook it up.

I've got an 88 monte carlo SS, stock wiring harness. Can anyone help me determine which wire is my tach hookup? or at least link me to some kind of reference?

Thanks guys!

 

[Doober]

It should be a white wire coming from the cluster. Didn't you have it hooked up before? The connection on the distributor is right next to the BAT+ terminal.

 

[custom442]

There are two wires going to your distributor - the tach wire is white and the hot wire is red.

You can rule out the hot wire by using a test light - if the light goes on when you turn the key a click or two (not engaging starter) then that is your hot wire.

If you have an aftermarket tach the wire is usually green.

 

[Phoenyx]

Are you using a faactory tach, or an afterrmarket one?

 

[CamaroAdam73]

It's he factory tach, i couldn't find a white wire coming from the harness in the engine compartment but i'll double check, and see if i can find the wire coming from the cluster itself and trace it back.

I have another small question about The Vacuum advance on my HEI distributor. My carb has two vacuum ports that i can hook it up to, one has vacuum constantly, the other only has vacuum when i throttle up, which one should i hook my distributors vacuum advance to?

 

[custom442]

It's he factory tach, i couldn't find a white wire coming from the harness in the engine compartment but i'll double check, and see if i can find the wire coming from the cluster itself and trace it back.

I have another small question about The Vacuum advance on my HEI distributor. My carb has two vacuum ports that i can hook it up to, one has vacuum constantly, the other only has vacuum when i throttle up, which one should i hook my distributors vacuum advance to?

There should be a white wire, I doubt you'll be able to trace it easily. Regardless, there are only two lone wires locked into your distributor with female wire disconnects surrounded in a plastic clip that clips on your dist.

You only need a full vacuum on a vac. advance dist. when rpms are higher, not at idle. Don't hook a vacuum advance to a full manifold vacuum unless it's pre-1970

 

[megaladon6]

really you have to ask the dist. manufacturer that as they vary. if it's a stock replacement custom442 should be right.
the tach wire is easy to identify once you find it. it goes from the coil plug to the firewall and has a cylinder (filter) in it.

 

[Doober]

The original wire going to the distributor would be brown, not white. The only place the wire is white is inside the cabin.

 

[custom442]

The original wire going to the distributor would be brown, not white. The only place the wire is white is inside the cabin.

no

 

[pontiacgp]

:?