Tach not working after installing electronic ignition

[hammer]

Had the old point distributor in and install the new electronic ignition. I cannot get the tach to work. Any suggestions for troubleshooting?

 

[EW1BH27]

Is it a a Mopar Electronic Ignition?
Is it an original tach or an aftermarket one?

 

[HooToTheCore]

Had the old point distributor in and install the new electronic ignition. I cannot get the tach to work. Any suggestions for troubleshooting?

My tach would not work with the Pertronix electronic ignition. Went back to points and it works fine.

 

[Xcudame]

Need a little more info like EW1BH27 is asking for. Stock time electronic control module and electronic distributor or "fancy" electronic ignition.

 

[Challenger RTA]

You will or can get 1001 answers if you not specific about your setup. And none of them will help.
Here is one example.
MSD Pro Billet 8546 distributor to factory Mopar Electronic Ignition Module wiring (no MSD box)

 

[hammer]

Is it a a Mopar Electronic Ignition?
Is it an original tach or an aftermarket one?

Mopar Electronic ignition and original tach. It is a Rally dash also.

 

[EW1BH27]

Mopar Electronic ignition and original tach. It is a Rally dash also.

That’s my exact setup and I have no problems. Sorry, I know that’s not any help.

 

[moparleo]

There were issues when doing this with an early tach and electronic ignition. What year setup are we dealing with ?

 

[Xcudame]

Your tach wire is hooked to the coil negative, correct?

 

[bc3j]

Might check the chip inside on the tach’s board. Found out the electronic box was not compatible with factory tach’s board. Had my tach rebuilt with the new chip and it works fine. Auto Instruments in Virginia did the rebuild and told me the tach will now work with any electronic system.

 

[moparleo]

Did it ever work or did you just do this conversion ?

 

[moparleo]

That is correct. Have you tested the tach ? There so many questions that need to be answered. This is a50+ year old system. There were adapters, replacement tach boards and not everything is compatable. Unless you are tyhe original owner, a lot of things could have been done in 50 years.

 

[Challenger RTA]

Funny thing! No two! I like talking to myself and answering too. The other, did one think of checking the bulkhead connector?

 

[Xcudame]

Challenger RTA, I talk to and answer myself a lot too! Most of the time I don't get into arguments with myself though! But I always agree in the end!

 

[Challenger RTA]

Challenger RTA, I talk to and answer myself a lot too! Most of the time I don't get into arguments with myself though! But I always agree in the end!

ME TOO and I love it!

 

[hammer]

Did it ever work or did you just do this conversion ?

Did work before with the conventional points

 

[MoparCarGuy]

If your tach worked before the changeover from points to electronic then you have a couple of options to stay with the same electronic ignition.
1. MSD 8920 Tach Adapter Available on Amazon. Converts tach signal for factory tach compatibility.
2. Replace the factory tach board with an aftermarket, and more accurate, aftermarket tach board. RT Engineering (RTE) makes the M5 Tach Board for E-Bodies. An article about the conversion to the digital tach board.
If you choose the RTE Tach Board, you should also consider changing out your Instrument Voltage Regulator (IVR) to a digital version. RTE has those as well. That way you take out the Rallye dash and fix both issues.

The pricing is about the same but the time/labor to install is a bit different. Your choice.

 

[Xcudame]

I can confirm the RTE products work! Worth the investment!

 

[Cuda360-4]

I put the Mopar electronic ignition on my car and the tach worked fine. Did you possibly just not reattach a wire or break one off? The original wiring can be brittle. I’d check all the original connections.