Tach does not work

[roterleschi]

Hello,

I have an MSD Pro Billet Ready to run 83873 ignition distributor with an MSD Blaster 2 ignition coil (8200) installed in a 69 Charger. I do not have an ignition box installed.
I tried connecting my tach to the gray wire. Then the tach does not work.
If I connect the tach to the minus of the ignition coil, then the tach goes, but it knocks out to the left and right, very violently.
Can someone tell me where the error is please?

Thanks and greetings
Sebastian

 

[Paul_B]

what tach are you using? For my tach I had to use an MSD tach adapter that converts the signal to one that my old tach would work with.

 

[roterleschi]

I use the original one.
Which adapter do you have?

Do you use the gray cable of the ignition distributor with the adapter?

 

[pnora]

Tach Conversion Question?

 

[BeepBeepRR]

This is the answer to your problems. I used it and it fixed my tach going nuts.

MSD Ignition 8920 MSD Magnetic Pickup Tach Adapters | Summit Racing

Free Shipping - MSD Magnetic Pickup Tach Adapters with qualifying orders of $109. Shop Tachometer Adapters at Summit Racing.

www.summitracing.com

 

[Paul_B]

I used the same MSD 8920 adapter mentioned above.

 

[pnora]

This is the one I used. TACH TACHOMETER SIGNAL BOOSTER, 3~16V In -> 48~63V Out, compare to MSD 8920 | eBay

 

[roterleschi]

Thanks. Its possible to use this Adapter without a ignition box?

 

[pnora]

Thanks. Its possible to use this Adapter without a ignition box?

I use the Tach Adapter I posted with the ready to run gray wire dizzy.

 

[BeepBeepRR]

Before you buy the tach adapter download the instructions and see if you can wire it up. Its not difficult.

https://documents.holley.com/8920.pdf

 

[Geoff 2]

The OP is NOT using an ign box, so not sure if the # 8920 is correct for him

 

[roterleschi]

Thats the point. I do Not have a ign box!

 

[roterleschi]

I use the Tach Adapter I posted with the ready to run gray wire dizzy.

Do you use a ignition box?

 

[pnora]

Do you use a ignition box?

Ready to run distributor has it all inside. No box.

 

[roterleschi]

is this Adapter also working? Anyone Knows this one?

Tach Adapter, Voltage Boost Module

 

[Geoff 2]

Contact MSD & ask them which adapter you need....

 

[roterleschi]

I did, no Answer yet

 

[Wietse]

I am using the same RTR distributor and coil, you will need the 8920 adapter.
Connect the grey wire from the distributor to the white wire of the tach adapter, then connect the violet wire to the tach wire.
+12V to switched connection and black to ground.

 

[roterleschi]

I am using the same RTR distributor and coil, you will need the 8920 adapter.
Connect the grey wire from the distributor to the white wire of the tach adapter, then connect the violet wire to the tach wire.
+12V to switched connection and black to ground.

Thx, its works!