North American Turbocoupe Organization

Reverse Glow Guages -- Voltage?
ameswarb Offline
Junior Member
A few months back I bought some reverse glow guage overlays, which for the most part followed the spec in the indiglo guage tech article in that it had the six overlays with wires coming out of each, with each wire having a male/female connector that plugged into a switching power supply box. The power supply box pulled power from a source (I had it wired to the dash light line) and from what I can tell transformed or resisted electricity so that the EL lights wouldn't burn out.

Unfortunately, due to some electrical problems the box burned out. I may have to order another, but I was just wondering if anyone knew the voltage limit / requirement for the guages?** I'd like to just wire them into the power source for my dash lights, completely bypassing the included power box thing (which is now burned out) so that when I flip on my headlights they'll just automatically come on, no needing to turn on the indiglos individually. I just don't want to kill the things.

** bold part indicates the meat of this post in case I went into too much of a tangent Smile
Owner of a Black 1988 Thunderbird Turbo Coupe

BJL Offline
the gauges use a transformer to INCREASE voltage to the limit the manufacter wants it at, there is really no way to determien that unless soem one else has the same gauges by the smae manufacter to check the voltage output . then you would have to make a transformers and your probaly looking at moer then the cost the gauges if you got them fairly cheap.....
Brian J Larkin
88TC 328,000 miles
T3, FMIC ,3in stinger exhaust, PimpXS ECC,gillis,
255 walbro, afpr, 5spd swap,spec clutch, sn95 5 lug, Cobra 13in front brake. Vacuum assist brake conversion. 
89 Cougar XR7 3.8SC Auto
95 Ranger Splash 3.0 auto

Jeff K Offline
It is even more complicated that Brian says.... Not only is the EL gauge voltage much higher than 12 V, but the "control box" also has active current limiting built into it. If you knew the voltage and current requirement of the EL displays, and were fairly good at designing electronic circuits, you could probably build your own "control box".
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized

ameswarb Offline
Junior Member
Thanks for the help guys. I guess I'll just wind up buying a new set eventually (I got mine for like $20). The reason the control box went out probably had something to do with me forgetting to solder and heatshrink my connections to the electrical system after I made sure it worked. Sad
Owner of a Black 1988 Thunderbird Turbo Coupe

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