ok ive noticed on my 89 Iroc 350/auto that i have a shift light on the far right of the warning lights, i took apart the dash to work on the speedo and noticed it didn't have a bulb. do they even work for autos and should i get a bulb or just leave it be?

 

It doesn't do anything on an auto.

 

ok is there anyway to make it come on at say 6 grand or so or is that to hard of a project? im just thinking of something else to do on the car

 

Since I'm no good when it comes to real electronics (like curcuits & crap), I'd buy a shift light, take it apart & use the guts to hook it up to the shift light bulb in the dash. It wouldn't be woth the cost but, it's the quickest/easiest way I suppose.

 

Although it didn't work when I did it, someone else mentioned that they installed a bulb and it would come on at seemingly random times. The shift light uses the same input on manual cars that the torque converter does on autos, so it was my theory that the light came on whenever the TC was locked. But like I said, it doesn't do that in my car when I installed a bulb there mistakenly during my dash installation.

 

Actually, if you don't mind spending a little ($50-60) money, you can buy the RPM activated switch that the shiftlites use; it's a little black box with some wires coming out and a socket for an RPM chip. It wires in to the tach lead on your distributor and can be used to turn on any circuit, like a shift lite, arm nitrous, etc.. ..
It'd be easier than tearing apart an adjustable shift lite, and bodging the guts together

Check in the gauges section of Jegs, Summit, etc, or go to your local speed shop. It's a pretty common item.

 

interesting thought about being tied into tcc, but my experience with shift light on an auto was:

shift light bulb comes on momentarily even when the car is cold and at relatively low speeds, tcc does not typically engage under such conditions.

also the converter stays locked for extended periods when driving on the highway at a constant speed, shift light only illuminates for a short time, not constantly.

 

Yeah, it was just a thought. Like I said, my bulb never came on no matter what. :shrug:

 

What if You place a auto cluster in a manual car, because I replaced mine with the auto one and was wondering if it would work.