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Thanks gamellot. I’ll be getting some vacuum hose to put in my kit. My rig ran fine, but just the issue with the CEL when stopped. These issues that pop up now and then just give our rigs more character!

The switch itself doesn't do what you need, but if you've got a relay and some wire, I think you can make it work. The square-dash cruise control switch is like an ignition switch. The brown wire (pin 1 in the manual) is your common, that'll get wired to power. The black wire with the white stripe (pin 2 in the manual) is your run position. And white with black (pin 3) is your start position. Pink/blue and pink/black (4 and 5) go to the dash lighting circuit. EL-81 of the '90 manual shows the pin numbering and the wire colors. Note that the pins are not in numerical order, because that would be too easy. If you don't have the '90 manual, you should be able to buzz out what's what with a multimeter. Run a wire from ignition-switched + (or your amp control wire) to pin 1 on the switch. Then wire pin 2 to one of the relay contacts (30 or 87). Then wire pin 3 to the other relay contact, and to one side of the relay coil (85 or 86), and also to your power antenna wire. Then ground the other side of the coil to the dash support. If you're using a five-pin relay, you'll have an empty pin (87a), and that's fine. Pin 1 gets power when you turn on the ignition, or the radio if you wired it to the amp. If the switch is off, nothing happens. If the switch is on, pin 2 gets power, but still, nothing happens. There are two sets of contacts that can connect pin 2 to the antenna amp, but they're both open. When you turn the switch to start, pin 3 gets power. That triggers the antenna amp and the relay. The relay closes the other set of contacts, so when you release the switch to the run position, the relay holds itself closed, keeping the circuit live and the antenna up. When power is lost (switch off or key/radio off), the antenna goes down, and the relay contacts open, resetting the circuit back to where it was at the start of this paragraph. If you decide to try this, draw the circuit out first and make sure it makes sense. It makes sense in my head. So have a lot of other things. Might be a good idea to add a snubber diode across the relay coil so it's not feeding the antenna amp EMF each time it loses power. There's probably a cleaner way of building this circuit using transistors, which wouldn't have that problem. I went a much simpler route on mine. I wired the amp turn-on through a toggle switch. It's a bit clunky, but the switch fills a hole in the dash, and I only listen to the radio a few times a year anyway.