Gauge

[Porsche 935]

I started my car saturday to go out for a ride. As the engine was warming up the oil pressure gauge was reading 20psi at idle and revved up to 50. usually goes to 65. I revved it a couple times then gauge went past 100 and down to zero. I recently replaced the sending unit because the gauge reading was irractical. I took the low pressure warning switch out and put a mechanical gauge in and it read 40 at idle and revved to 75. From that I think the gauge has kicked the bucket. It's only 43 years old. I made an adapter to go in the oil temp sending unit today, do you think this is a good place for an accurate reading or was the idiot light hole ok ?

[Porsche 935]

Nobody ever hooked up a mechanical gauge to your car?

[gumba]

This is on my 3.3 turbo bus. Reads 5 psi + higher than the dash gauge. I also run a mechanical fuel pressure gauge T'd off the wur.

[gumba]

Pelican carries the housing.
Pelican Parts - European Automotive Parts and Accessories - Porsche • BMW • Mercedes • Volkswagen • Audi • Saab • Volvo • MINI

[gumba]

well that didn't work, try this.

Mechanical Oil Pressure Gauge Block, includes 3 seal rings, 911/911 Turbo, (1974-89)
Part #: PEL-PBSCECZZN

[Porsche 935]

Well. great news is the oil pressure is good. Started engine with new mechanical gauge and it read 50psi and revved to 70. Let it warm up and oil dropped to 35 and revved to 70. But gauge read 20 at cold start and does not go past 30. Need new gauge, since sending unit is new and original sending unit reads the same. Anyone have a 140 oil gauge laying around?

[Porsche 935]

I got a new gauge and put it in the dash. Matches reading from mechanical gauge. Can the original one be repaired?

[gumba]

Either North hollywood speedo or Palo Alto Speedo can do it.