69 vs 70+ gauge opening sizes?

[lkadams]

I found a couple of threads to reference:
http://www.early911sregistry.org/for...ighlight=gauge
http://www.early911sregistry.org/for...ighlight=gauge

But no definitive answer - are the gauge hole openings on the 69 smaller than the 70+ cars? I am changing out the gauges in my 912 and want to know if I have to futz with the thumbscrews (honestly - how did they get those on in the first place?) or can I use the later rubber ring friction mount of the later cars? I suspect the dash holes are slightly larger in the later cars.

[Alan.uk]

Hi,

Gauge holes are smaller in pre 70 cars. Porsche started to use the wider socket fit rubbers for the 70 model year.

HTH

Alan

[lkadams]

Thanks Alan!

[boxster03]

I had no idea. good info. this should be in the model yr. specific thread.

thanks

[911pcars]

Hi,

Gauge holes are smaller in pre 70 cars. Porsche started to use the wider socket fit rubbers for the 70 model year.

HTH

Alan

You sure? I think the opposite. I have a '69 with late tach and speedo gauges. They wouldn't fit if the gauge opening was smaller. Up to '69, the gauges are retained with a U-shaped bracket with thumbscrews to secure in place. Later gauges use a rubber sleeve to provide a friction fit in the IP.

Sherwood

[lkadams]

You sure? I think the opposite. I have a '69 with late tach and speedo gauges. They wouldn't fit if the gauge opening was smaller. Up to '69, the gauges are retained with a U-shaped bracket with thumbscrews to secure in place. Later gauges use a rubber sleeve to provide a friction fit in the IP.

Sherwood

Sherwood - did you use the later gauges with the rubber sleeves, or with the U-brackets and thumbscrews?

My question/problem is related to using 69 gauges and a 69 dash, but using the rubber rings to make it a little easier.

[andyjboy]

The gauges are the same size - like for like - eg all '65-'89 speedos have the same casing diameter, etc.

However, as Alan states, the holes in the dash are smaller for the versions held in via brkts on the rear of the gauges.

[911pcars]

Sherwood - did you use the later gauges with the rubber sleeves, or with the U-brackets and thumbscrews?

My question/problem is related to using 69 gauges and a 69 dash, but using the rubber rings to make it a little easier.

Keith,
The late rubber rings would make the OD of the gauge too large for the opening. I don't recall, but perhaps the early factory gauges were equipped with a thin rubber sleeve, maybe nothing at all. The factory parts illustrations should comfirm what was really there.

Late gauges don't have threaded mounting posts on the back to use with a U-bracket.

Sherwood

[304065]

SWB gauges have a thin rubber ring right next to the chrome ring.