When I first drove the 914 during the day with 'proper' improved gauge illumination i immediately knew I was going to want it on all the time. Didn't think it would be any help during the day and my not even be noticeable. But what I found was the gauges were now 'alive' so to speak, as if they were sort of dead before. I had done all the led bulb upgrading that was available and even tried 'backlighting' with the first led strips that became available, as everyone has done by now... I was mainly looking for better night visibility, and they surely got better at night but all with light and dark areas that really took away from the uniform design of these gauges. Front lighting solved that issue, so the next challenge was how to make it good.
Understanding these limitations helps explain why modern lighting upgrades make such a noticeable difference.
Gauge lighting was pretty much limited with low watt bulbs to keep heat down and small standard sized bases to fit into small spaces. 914 like other Porsches and higher end cars were built for car guys (and gals) and car guys wanted 'real' gauges. But 'real' gauges were a very old-fashioned design and basically illumination was a bulb in a can. Cheaper cars were going to cheaper gauge movements integrated to a cheaper single large circuit board. These designs were basically using the same similar low wat bulbs, but they would use clear acrylic panels to move the light where it needed to be. 914's remained using high quality real gauges but still limited to lighting that was old fashioned and just 'adequate' and nothing more.
Experimenting with extra bulbs was actually a good idea at spreading light to and around the wonderfully laid out VDO faces but the internals made it impossible to light the faces evenly and the bulbs were still low output and yellow light. The modern led replacement bulbs were an improvement but still suffer from location problems like filament bulbs and can't illuminate the faces the way they were designed to be seen. Uneven, light, dark, shadows. They do well for the indicator bulbs though. New led strip lights became the way to get more bright white LEDs to fit inside the gauge cans. you could put in just about as many as you could imagine inside the cans, behind the face. This actually became a recommended practice and there were even some you tube videos showing how. Sadly, the result was no uniformity in brightness of the 3 gauges and light and dark areas were magnified. They sadly looked like a back yard hack job done by a kid. This was the proof that there was no way to properly back light the 914's factory VDO gauges and maintain a high-quality factory appearance. No matter how many led or how bright they are backlighting is just not going to work. I found that the only way to solve this is to front light the gauges. These early led strips were wide and bulky. Thet didn't conform well didn't stick well. Individual LEDs were spaced far apart. Trying to use them for front lighting was futile. New design of COB super bright led strips was an incredible advancement in led lighting technology. These new strips produced continuous light in a super flexible and durable strip of silicone with an impressive thick 3m sticky backing. They were finally narrow enough to fit in the ideal location to front light the gauges. Now getting the correct width of the strip, the correct color of light and the correct length and number of segments for each gage was possible.
If you're ready to solve the root problem instead of just replacing bulbs, see the Porsche 914 Ultimate LED Gauge Restoration Kit.
Getting each gauge to match in illumination was crucial to a quality intentional factory look. I had not seen any replacement led bulbs or strip lighting attempts that could do this. Also illuminating only, the gauge calibration marks from 0-max on the tach and speedo looked much better and more intentional and truer to original design than simply running the led strips completely around the gauge. With the length and number of led segments figured out, all 3 gauges had equal light intensity and could now be controlled with one rotary dimmer. The final effect was gauges lighting that actually works. It delivers a level of control that you never had before. In the morning or overcast days, with a slight turn of the knob the gauges come alive. It gave a feeling of more control, like the gauges are working fir the first time. Like they were dead and now they are alive. Every time I drive the 914's I reach for the dimmer to find a noticeable boost in light for the drive. I wired it to the ignition so it's always available even when the headlights are off, also because I like to see it come on when I crank the car in the garage! For night driving it has become a true necessity in comparison to the stock bulbs. Night driving is absolutely spectacular with excellent visibility and eye appeal. It gives a Porsche-level quality look and feel with total control over brightness. Your same gauges are now alive and instead of you looking for your gauge readings, they are being 'shown' to you. It's a super satisfying upgrade that really pays off when you get behind the wheel.
Modern LED lighting upgrades solve these limitations by providing more even illumination across the gauge face and improving overall visibility.
If you’re working on improving Porsche 914-gauge visibility, these related guides explain how the system works and what upgrades make the biggest difference:
