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73-87 Chevy _ GMC Trucks => Interior & Equipment => Instrumentation => Topic started by: acfixerco on April 12, 2014, 12:28:52 pm

Title: Tachometer Grommet Firewall Picture
Post by: acfixerco on April 12, 2014, 12:28:52 pm: Hi,

I have a 1982 silverado with factory gauges and the large gas gauge to the right of the speedometer. Recently I scored a factory gauge cluster with tachometer and wiring harness from a 1981 at my local pick a part.

Being a bonehead, I did not take a picture of the firewall where I removed the grommet that transitions the firewall to the interior.

Would any of you please post a photo of the under hood grommet location on your firewall?

I know it is plug and play and it has been mechanically refurbished at a local speedo shop.

Thanks,

acfixerco
Title: Re: Tachometer Grommet Firewall Picture
Post by: KWKENUF on April 12, 2014, 01:46:11 pm: There is a big bundle of wires that pass through a grommet, your tach wire should go through the same one.
Title: Re: Tachometer Grommet Firewall Picture
Post by: acfixerco on April 12, 2014, 02:47:16 pm: I appreciate your reply.

The factory harness has a white lead with an affixed grommet that transitions the firewall, connects to a condenser mounted to the exterior of the firewall then proceeds to the tach terminal of the distributor.

This is not one or more wires, it is a factory dedicated single wire attached to the grommet. Know anyone with a 73-87 w/ factory tach?
Title: Re: Tachometer Grommet Firewall Picture
Post by: KWKENUF on April 13, 2014, 12:23:50 pm: Must be the tach signal filter you are talking about. Sounds like you know know more than me, so I can't be any help. Sorry.
Title: Re: Tachometer Grommet Firewall Picture
Post by: Sartobuilt on April 13, 2014, 06:32:06 pm: This is on my 1980. Its the white wire @ 4 o'clock from the bulkhead connection. There are dimples in the firewall for locations. The tac wire is a single wire with a gromet molded on.

(http://i96.photobucket.com/albums/l179/Sartobuilt/IMG_1038.jpg)
Title: Re: Tachometer Grommet Firewall Picture
Post by: acfixerco on April 14, 2014, 04:36:09 pm: Thank you so much! I could not have received a more clean photo and instruction. Appears you are doing a restoration, nice.