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While the TDR setup I mentioned wouldn't monitor voltage and run an afterglow. Truth be told, my CUCV never after glows and it's not a problem. Outside of that, converting the temp sensor to a switch would make a simple TDR function much like the glow plug card. If you did need afterglow, you...

A time delay relay could be purchased much cheaper than the replacement card if one doesn't have one. Less than $10 on amazon. The rest is just wiring. While it wouldn't be as fast as plugging in a card, if one didn't even have the card housing, they're going to be addressing the wiring...

A time delay relay is absolutely a viable option. Just use it to power the glow plug relay. I'd recommend using a coolant temp switch though to provide ground to the TDR. That way it won't toggle when the engine is warm. You could also use that setup as a completely automated way to start...