I am trying to source an origina 914/6 combo gauge. I have found several and they all have part number 914 641 101 10. The Porsche 914-914/6 Classic Parts Catalog lists the part number as 914 641 101 20. I called my local Porsche dealer to try and verify these part numbers. The 914 641 101 20 comes up as the OEM Gauge for 914/6 as discontinued. Part Number 914 641 101 10 comes up as a factory Gauge with no designation as to model, also discontinued. The Gauges with the 10 designation look right, could it be this was the original part number in 1970 and replaced as a over the counter part number with a 20 designation?

Can't find neat site that documents 914 gauges, but there are with & W/o oil temp gauge insert, as well as silver dot, non silver dot options
Good luck !

Just looked at mine, factory -6, Mar '70.
Gauge p/n 914 641 101 10

Found this info on p914.org... but all links point to p914.com which for some reason does not load. So, replace .com with .org and the page loads fine.

1970 - 1972 Porsche 914/6 Combo Gauges
The Porsche 914/6 models were all equipped with oil temperature / fuel level combination gauges which are stylistically similar to the 1973 "silver button" units. The vast majority of Porsche 914/6 cars contain combo gauge part number 914 641 101 10 which is not documented in the parts catalog, although it is pictured in the owner's manual. As is normal, the catalog names only the final gauge used, part number 914 641 101 20, as the combo gauge appropriate to all Porsche 914/6 cars. The transition to the ".20" gauge began near the end of the 1971 model year production and extended into the 1972 cars as inventory of the ".10" gauge was depleted.
The 914 641 101 10 Porsche 914/6 combo gauges differ from the 1973 914 combo gauges (part number 914 641 101 30 described above) in the symbol for the brake, the positions of all three warning lights and the entire temp gauge insert. This temperature scale is multicolored and equipped with a warning light (amber section as in the fuel gauge insert. The scale is from 50-66 degrees Celsius in the white-striped warm-up zone, the single white line 66-129 degrees Celsius operating range with a 109.5 degree optimal marker (straight up), 129-144 degree red-striped danger range, followed by the solid red "higher than 144 degrees Celsius - your engine is cooked" range. Similar to the Porsche 914 gauges, nearly all 914/6 units have the yellow "blank" lens with a backlight bulb behind it. Units in Porsche 914/6 cars delivered with the Sportomatic transmission have an operational warning bulb and red lens in this location which is used for the tranny oil temp.
The much less-common 914 641 101 20 Porsche 914/6 combo gauges are a logical transition to the 1973 914/4 combo gauges, because they are identical with the exception of the temp gauge insert (which is, of course, appropriately scaled for the six cylinder engine). As with all "silver button" gauges, the two-piece, painted steel bezel on these units is prone to rust. Thanks to Wolfgang Scheigher for providing a picture of the ".20" combo gauge from his late 1971 Porsche 914/6!

I did not see a picture of your Combo Gauge, however I did locate three for sale with that part number. Thank you for responding to my request.

Just fyi for anyone looking - appears that Brad Mayeur has a very nice -10 unit on ebay:

https://www.ebay.com/itm/Porsche-914-6-Fuel...R4AAOSwc4pf--K1

[quote name='poorsche914' date='Jan 11 2021, 06:27 PM' post='2882120']
[quote name='barefoot' post='2882079' date='Jan 11 2021, 02:23 PM']Can't find neat site that documents 914 gauges, but there are with & W/o oil temp gauge insert, as well as silver dot, non silver dot options
Good luck ![/quote]
Found this info on p914.org... but all links point to p914.com which for some reason does not load. So, replace .com with .org and the page loads fine.

1970 - 1972 Porsche 914/6 Combo Gauges
The Porsche 914/6 models were all equipped with oil temperature / fuel level combination gauges which are stylistically similar to the 1973 "silver button" units. The vast majority of Porsche 914/6 cars contain combo gauge part number 914 641 101 10 which is not documented in the parts catalog, although it is pictured in the owner's manual. As is normal, the catalog names only the final gauge used, part number 914 641 101 20, as the combo gauge appropriate to all Porsche 914/6 cars. The transition to the ".20" gauge began near the end of the 1971 model year production and extended into the 1972 cars as inventory of the ".10" gauge was depleted.
The 914 641 101 10 Porsche 914/6 combo gauges differ from the 1973 914 combo gauges (part number 914 641 101 30 described above) in the symbol for the brake, the positions of all three warning lights and the entire temp gauge insert. This temperature scale is multicolored and equipped with a warning light (amber section as in the fuel gauge insert. The scale is from 50-66 degrees Celsius in the white-striped warm-up zone, the single white line 66-129 degrees Celsius operating range with a 109.5 degree optimal marker (straight up), 129-144 degree red-striped danger range, followed by the solid red "higher than 144 degrees Celsius - your engine is cooked" range. Similar to the Porsche 914 gauges, nearly all 914/6 units have the yellow "blank" lens with a backlight bulb behind it. Units in Porsche 914/6 cars delivered with the Sportomatic transmission have an operational warning bulb and red lens in this location which is used for the tranny oil temp.
The much less-common 914 641 101 20 Porsche 914/6 combo gauges are a logical transition to the 1973 914/4 combo gauges, because they are identical with the exception of the temp gauge insert (which is, of course, appropriately scaled for the six cylinder engine). As with all "silver button" gauges, the two-piece, painted steel bezel on these units is prone to rust. Thanks to Wolfgang Scheigher for providing a picture of the ".20" combo gauge from his late 1971 Porsche 914/6!

Thank you for your in depth research on my request to clarify the part numbers on a 914/6 Combo Gauge. I appreciate you doing this and now can source the correct Gauge with confidence