1987 PORSCHE 911 TACHOMETER NOT WORKING

SOURCE: Battery on a porsche boxster is dead will not start up

If the battery is VERY dead it may take quite a while jump start the car. You may have to run the car with the good battery for five or ten minutes to get enough charge in the old battery to start the car. Other wise a very dead battery will just "soak up" the electricity from the good battery. If your battery was old to begin with it may be unserviceable. I would take the battery out and take it to an auto parts store that can charge and test it. They will usually do this for free.

SOURCE: on my 1987 porsche 911 repaced the fuse and the

Hello there
Under the break fluid reservoir is the break master cylinder -there are two press.switches with two or (sometimes earlier wersion) three prong switches.
The second switch is the one you propably need to replace.(second-looking from front of the car)
To get to them you need to remove the black cover with 10mm socket wrench and flat screwdriver.
Remove (black plastic) air hose which is on top the master cylinder and then you can see the switches.
Before you replace the switch ,unplug the connector a insert a short wire into it.That will, with the ignition on, make your brake light go on.if yes replace the switch if not
contact me at
[email protected]

ivan

SOURCE: hi ihave a 2007 porsche

Petrol (or gas if you are American) does deteriorate when left for a long time, 2 months is not that long. Run the tank down as far as you can without getting stranded and fill up. If it is the fuel then the problem will go away.I would see if you can persuade your dealer to run a diagnostic if it continues to be rough, as it could be as simple as a corroded contact on a sensor.
I hope I have been of help but please do not hesitate to ask if you have any further questions.
I appreciate your vote if you appreciate my reply.