RE: {Chrysler 300} 1961 300 g tachometer question

Just on the power issue John raised, I would like to correct this often-repeated quote as the coil does not get 12V/13V with Chrysler ballast resistor circuits. More like 8V/9V while running. While the numbers are wrong, John is technically right that there is a proportional power loss. But he neglects the other side of the equation in that power is also inversely proportional to resistance. Lowering the coil resistance will increase the power to the coil, if that’s what you want.

Back in my younger days, the go to hot up mod was to fit a Bosch GT40R coil. Didn’t matter whether you had a Ford, Holden or Chrysler, that red coil on the side of your engine showed you meant business! The primary resistance is 1.2 ohms which is typically lower than factory coils, therefore more power with a higher voltage output.

I have had one on my Val with factory electronic ignition (pre ELB version) for 25 years now without any problem. About a year ago I bought one at my local parts store (in stock/on the shelf) for our 65 Mustang. Having an aftermarket part available for 40 years tells you all you need to know about reputation and reliability. Sadly, they now seem to be discontinued… Probably not enough need for this type of coil any more to justify room on the shelves.

Cheers

Henry

From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> On Behalf Of John Grady
Sent: Thursday, 27 November 2025 4:58 AM
To: Bob Jasinski <rpjasin@xxxxxxxxxxx>
Cc: Allan Zolis <allanzolis@xxxxxxxxx>; chrysler-300-club-international@xxxxxxxxxxxxxxxx
Subject: Re: {Chrysler 300} 1961 300 g tachometer question

agree,in fact nothing wrong with points,10k miles no bs ,curve in MSD will not match stock. Trouble with pertronics if it punts you walk. Maybe a long wolk. Points and business card you go.Points do not lose the 1 volt of solid state either. Power in EE goes as square of volts,you lose 144/169 , significantly weaker spark

On Wed, Nov 26, 2025 at 12:11 PM 'Bob Jasinski' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

Allan,

Do yourself a favor and keep the original tach drive distributor. Install a Pertronix unit, easy to do, you will keep the original look and tach drive function of the stock distributor. I’ve had one in my G since 2011, I’d never go back to points.

Bob J

From: chrysler-300-club-international@xxxxxxxxxxxxxxxx <chrysler-300-club-international@xxxxxxxxxxxxxxxx> On Behalf Of Allan Zolis
Sent: Wednesday, November 26, 2025 4:28 AM
To: chrysler-300-club-international@xxxxxxxxxxxxxxxx; Allan Zolis <allanzolis@xxxxxxxxx>
Subject: {Chrysler 300} 1961 300 g tachometer question

Hi Everyone,
I decided to replace my dual point distributor with a MSD system. My question is, since this new distributor does not have a drive for the tachometer cable, (it still lights up) is there a way to either hook up a drive or either convert this tach to electronic?

Thanks again for any insight you can provide.

Happy Thanksgiving everyone!🍗

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Allan Zolis
Odessa, Florida
allanzolis@xxxxxxxxx
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