I recently bought an aeroforce scan gauge for my 3800 powered car. I do not have an add a circuit and none of the stores near me have them. Anyone know a good place to get 12 volts that is switched and constant while the car is on?

You don't have a Canadian Tire or Partsource around you?

That's where I got my add a circuit from for my aeroforce gauge

Yep, both and they were both out.

How about power to the radio?

I have used the aeroforce for 2 years. I just have mine plugged into the OBD2 port. I dont recall any additonal wiring needed.

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84 NB, 3800SC, E-85, VS Cam, 3.0 Pulley, 4T65E-HD, HP Tuners, AEM Wideband, Regal GS Gauges, S-10 Brake Booster. 1/4 mile -12.05 at 111.7mph

OBD2 has unswitched +12v on pin 16. Assuming it idles down to a low current mode it could be designed not to need switched +12v.

C203 pins F, J, and K have switched +12 on them.

If you have a 4 speed, the dark blue wire of the reverse switch in the console also is a source of switched +12.