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Porsche 914
Combo Gauges


1974 - 1976

Porsche 914/6
Combo Gauges

Porsche 914 & 914/6 Combo Gauges

Setting the 2.0 Liter Standard

Porsche 914 models purchased with the 2.0 Liter engine but without the "Appearance Group" (which included the three-gauge center console) were delivered with an oil temperature / fuel level combination gauge. A similar gauge was standard in all 914/6 models. In retrospect, one might question why such a vital gauge was not standard in all Porsche 914 cars thereby creating space for an oil pressure gauge in the optional center console.

Similar to the fuel gauges, the combination gauges housed indicators for the oil pressure, alternator (marked with a "G" for the German "generator") and parking brake / brake system. Like the speedometer and fuel gauge, the combo gauge case is 100 mm in diameter. Combo gauges are not sealed; they can be disassembled via extraction of tiny screws on the back enabling removal of the upper and lower plates containing the temp and fuel gauge mechanisms. This design permits fairly easy restoration.  Problems pervasive to all 914 combo gauges include needle fading and lens fogging / scratching, although fogging issues can be fairly easily remedied through removal of the gauge mechanisms and subsequent cleaning.

Current eBay listings for Porsche 914 combo gauges (compare listed gauges with those pictured on this page to ensure authenticity and model year utilization):

Porsche 914 and 914/6 Combo Gauges on eBAY

NOTE: The combo gauge was not available on the 1970-1972 Porsche 914 models, as it was associated strictly with the 2.0L cars (either four or six cylinder), and only the 1.7L engine was offered in the 914 during these years. Actually, no oil temperature gauge was available from the factory for the 1970-1972 Porsche 914 cars, as the optional three-gauge center console was also intruduced in 1973.

1973  Porsche 914 Combo Gauges

The 1973 and very early 1974 Porsche 914 combination gauge is commonly referred to as a "silver button" or "silver center" gauge, because it has a silver-colored cap in the middle. The gauge has the brake, alternator and oil pressure warning lights mentioned above and also includes a yellow "blank" lens (blocked-off with electrical tape inside the gauge) immediately right of center, behind which the backlight bulb resides. These units have deep bezel rings, and glass lenses. The temperature range is printed on the gauge face, but it is in type too small to read while driving (and is hidden under the rim of the gauge anyway, so to even see it, you must hold the gauge at a severe angle). The range begins at 60 degrees Celsius. The redline begins at 156.7 degrees Celsius (it's a Porsche gauge, so it is exact), and terminates at 200 degrees Celsius (your engine might actually be on fire at this temperature). As the actual gauge sections are easily removable from the housing, you will sometimes see this "silver center" gauge housing fitted with the more common temp gauge section from the later model years. This works fine (and may be preferable from a functionality standpoint), but is not "factory original" (if that is your goal). As noted above, the silver center combo gauge, part number 914 641 101 30, came only in the 1973 2.0L models in which the popular "Appearance Group" was not ordered, making them extremely rare. As with all "silver button" gauges, the two-piece, painted steel bezel on these units is prone to rust.

By 1973, the department that produced  the Porsche 914 owner's manuals were having difficulty matching the rate of change for the fuel and combo gauges. Subsequently, the 1973 manuals incorrectly picture the fuel gauge used the prior year and make no mention of the fuel level / oil temperature combination gauge.

1974 - 1976 Porsche 914 Combo Gauges

The 1974-1976 Porsche 914 units are commonly referred to as "black center" gauges, because they have do not have the silver-colored cap found in the earlier style. They have shallow, one-piece, black-painted steel or (in 1976) brass bezel rings and most have plastic lenses that are prone to scratching. These later combo gauges, bearing part number 914 641 101 50, contain the same indicators and blank lens that the 1973 version had, and the temperature range is similarly illegibly printed on the gauge face, but the scale is different. The range begins at 30 degrees Celsius, and the redline, while still beginning at 156.7 degrees Celsius, has shrunk and terminates at 170 degrees Celsius (at which point your engine would be seized, but not burning). the ".50" combo gauges came in the 1974-1976 2.0L models in which the "Appearance Group" was not ordered, making them rare, but more common than the 1973 combo gauges.

Although it was also omitted in the 1974 Porsche 914 Owner's Manual, the combo gauge finally makes an appearance in the 1975 book. Amusingly, the illustration that appears is incorrect, seemingly created by using a negative image of an illustration of the combo gauge used in the 1973 cars... which had never made it into the 1973 owner's manual. The fuel gauge illustration is similarly incorrect.

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!