73 340 4 speed Reverse.
Lock out light on dash location needed.

Syleng1 said

It’s funny the length we go to to make it “correct” when the odds are you will never, ever be so close to another car that also has the reverse light under the dash and anyone is going to measure. We forget that 1/2 the people measuring will use yours as the correct spot even though they have no idea.
My 72’ has that light to tell me I’m in reverse. It’s silly. I don’t even know it is on because when I go into reverse I’m not looking down.

It’s cool to want it in the proper place.
I get it.

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I mean it’s actually a bit more complicated than that, you can’t just drill a hole anywhere. I wasn’t worried about it being in the perfectly stock location, pretty much nothing on my car is stock.

But if you take a look under the dash and where that light actually goes, you’ll see that there’s under structure you wouldn’t want to drill into, braces for things and attachments etc.

I’m sure that every reverse light isn’t in exactly the same place, but there is a “window” that you want to hit if you want to be able to get to it and not hit something that would prevent you from fully installing that light. So having some general measurements makes it a lot easier.

I didn’t run one when I had a 4 speed, never really too much of a question if the 833 was in reverse just because of the pattern and spacing. I did add it after I installed my T56, because 5th and reverse are right next to each other. It does have a lockout to keep you from shifting into reverse while moving more than a couple miles per hour, but that doesn’t help when you’re sitting still.