{Chrysler 300} EL question- old vs. new 300 displays

[John Nowosacki <jsnowosacki@xxxxxxxxx>]

I have a few spares of the Electroluminescent (EL) power packs in my stash.

The newer (now obsolete) Chrysler 300 (along with the Magnum from Dodge) also has an EL system for backlighting the dials on the dash.

Apparently the more modern EL power supply is not as robust as the ancient original, and is prone to failure.

There is a simple plug-in two wire connector on the modern EL display, and I'm wondering if I could potentially use the dimmer rheostat and an older style power pack to power the  system in my old Magnum?

I think the new system only requires about 145V ac for the display to be bright, and a well functioning antique power supply puts out more like 220 when fed by 13V dc, but the rheostat would limit the DC voltage which would then limit the AC output.  I couldn't find any specs on the frequency of the AC for the new system anywhere (yet), but I know it's 400Hz for the old system.

There is a somewhat cumbersome repair/upgrade kit available online for the new system, but it's more work than just hooking up an older style power supply to the new display.  

Any EE types out there who know about the new EL system display electrical requirements compared to the old system?

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