63 dash relay?

[William B.]

This relay is behind the inst. cluster, not sure what it is used for ,952 on base, please review pictures and identify if possible

[William B.]

I believe it's a buzzer for 63, only used in early cars with a high horse tach

[Don H.]

I think you're right Bill. The tach will have the salmon color area to 6500 instead of yellow, before the red area up to 7000. Got a photo of that? Very rare I believe.

[Jojo S.]

Bill, What is your serial number? I'm assuming it is early. Can you post a photo of the back of your cluster at the tach area?

There was also a range of serial numbers where the buzzer was mounted but never wired.

[William B.]

Hi Joe, serial # below 4000, pics of tach, I assume this would not be tested for PV,

[Joseph S.]

Hi Joe, serial # below 4000, pics of tach, I assume this would not be tested for PV,

Bill, Sorry, I answered earlier under JoJo's account!

You have the buzzer & the tack is set up for it to be wired. There should be a stand alone harness for that buzzer system. I believe the colors are pink & gray if my memory is accurate. At that serial number, you'll need the buzzer wired and it will need to work during a PV. We can talk about that in Florida if you're going.

[William B.]

Bill, Sorry, I answered earlier under JoJo's account!

You have the buzzer & the tack is set up for it to be wired. There should be a stand alone harness for that buzzer system. I believe the colors are pink & gray if my memory is accurate. At that serial number, you'll need the buzzer wired and it will need to work during a PV. We can talk about that in Florida if you're going.

I removed the wiring harness myself, found no seperate wires going to the buzzer, ordering a new harness, hope that's included, Guess I can make one up.

[Duke W.]

Bill, Sorry, I answered earlier under JoJo's account!

You have the buzzer & the tack is set up for it to be wired. There should be a stand alone harness for that buzzer system. I believe the colors are pink & gray if my memory is accurate. At that serial number, you'll need the buzzer wired and it will need to work during a PV. We can talk about that in Florida if you're going.

The PV requires the engine to be revved to 90 percent of redline, so that would be 5850... call it 6000. But since I assume that the buzzer won't activate until 6500 or real close to it, how can function be verified during a PV?

BTW, it's been awhile since I read it, but Nolan's book has a good bit of info on the "buzzer tach" based on his surveys. IIRC some had a buzzer tach, but no buzzer and some had a buzzer but no buzzer tach... bottom line was the thing never worked worth a damn even if all the proper parts were installed. I recall the Chevrolet marketing info stated that it was only included with the FI engine, but Nolan's survey indicated early 340 HP engines had it too... or bits and pieces as above.

Duke

[Joseph S.]

The PV requires the engine to be revved to 90 percent of redline, so that would be 5850... call it 6000. But since I assume that the buzzer won't activate until 6500 or real close to it, how can function be verified during a PV?

BTW, it's been awhile since I read it, but Nolan's book has a good bit of info on the "buzzer tach" based on his surveys. IIRC some had a buzzer tach, but no buzzer and some had a buzzer but no buzzer tach... bottom line was the thing never worked worth a damn even if all the proper parts were installed. I recall the Chevrolet marketing info stated that it was only included with the FI engine, but Nolan's survey indicated early 340 HP engines had it too... or bits and pieces as above.

Duke

Hi Duke, I hope all is well. There are 2 different tests. The PV requirement of the car revving to 90 percent of redline is an "acceleration" test. The reason for this is to be sure that the car pulls strong to 90% without breaking up or stumbling. The tach buzzer can be checked static just by revving the engine to redline.

I hope this clarifies your question.

Joe

[Mike M.]

Hi Duke, I hope all is well. There are 2 different tests. The PV requirement of the car revving to 90 percent of redline is an "acceleration" test. The reason for this is to be sure that the car pulls strong to 90% without breaking up or stumbling. The tach buzzer can be checked static just by revving the engine to redline.

I hope this clarifies your question.

Joe

I had an early dec 63 fi coupe 30 years ago. it had its original dash main harness that was nice enough to use during the restoration. it had the buzzer and the buzzer tach but no 2-wire harness to connect them. being anal, I made up a harness to connect them. hearing the buzzer go off was nearly impossible and my hearing was a young 50 years old at the time. I'm certain I'd never hear it nowadays.mike mccagh

[Don H.]

Bill, since you're going to have to create the harness to run to the buzzer, and we're all ancient now and can't hear anything (unassisted), including your PV proctor, perhaps make the harness long enough to lay the buzzer on your console during the test,
you can always bundle it up later and tie to the Z-bar afterwards.

[Duke W.]

The tach buzzer can be checked static just by revving the engine to redline.

I hope this clarifies your question.

Joe

If a PV candidate still has the weak OE connecting rods I would not recommend free revving the engine to 6500 or whatever is required to activate the buzzer. Consideration should be given to waiving this test.

Duke

[Duke W.]

I had an early dec 63 fi coupe 30 years ago. it had its original dash main harness that was nice enough to use during the restoration. it had the buzzer and the buzzer tach but no 2-wire harness to connect them. being anal, I made up a harness to connect them. hearing the buzzer go off was nearly impossible and my hearing was a young 50 years old at the time. I'm certain I'd never hear it nowadays.mike mccagh

I've never heard the ill-fated early '63 tach buzzer. Decades ago a friend had an early 80s Mazda RX-7. At about 7000 it made this wimpy buzzing sound that we always laughed at.

I'm glad my mid-production SWC didn't have one if it sounded that bad.

Duke