http://www.sears.com/shc/s/p_10153_12605_00914065000P?keyword=advance+timing+ light

Any idea how accurate the dial back feature is? I bought a cheaper brand version like this and it was horribly inaccurate (almost 10 degrees off) so it went back to the store. I'd like to have a dial back light, just want an accurate one without spending a fortune.

I have their older chrome type, works fine. How did you determind that it was not correct?

I have their older chrome type, works fine. How did you determind that it was not correct?

Same here

I also have the Chrome one...............and I also wonder how you determined that it was off?

Rich,
Also keep in mind that if you are running an MSD ignition system, MSD does not recommend using any type of dial back light. I would think that this would be true with any type of multi spark ignition.

How to check it? Easy.

With it set to zero, check the timing, let's say it reads 16 degrees BTDC on the balancer. Then, without changing anything on the engine, dial it to 16 advance and see where it reads. It better read zero on the balancer or the calibration isn't right. Would you buy a tool like this and just assume it's accurate?

No MSD on any of my cars. I bought a Pertronix Second Strike for the wagon but I never installed it. The instructions with that unit state that the multiple spark feature needs to be turned off (easy to do on this unit) to set the timing accurately.

I also have the Chrome one,never had any problem.

I have one, checked as Rich mentioned. It's accurate, well mine is.

Have a thirty year old Chrome one and still works fine.

I have the chrome one too.

Bought the chrome one 2 years ago-no problems.

Got a chrome one that 10 y /o.
Mine seems to work good.

Had a chrome one for a few years, but noticed the mark would bounce around if the dial wasn't on 0 (flaky pot.). Bought a digital Equus light 4 years ago and it's worked like a charm.

I have the chrome one, about 15+ years old now, but works fine...