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There's a black box attached to the firewal on the drivers side usually behind the master brake cylinder, check it has vacuum hoses leading to it, and that the power plug is physically plugged in. Without a vacuum hose attached it will read 0 all the time.

Check if your vacum hoses and cables are still connected, and maybe trace them back to see if there is any problems, had similar trouble when I got my 32.

ok this may seem like a stupid qsn but where should i start with these vacuums and cables :D ?

Edited by tommygunn
There's a black box attached to the firewal on the drivers side usually behind the master brake cylinder, check it has vacuum hoses leading to it, and that the power plug is physically plugged in. Without a vacuum hose attached it will read 0 all the time.

I don't know my way around a skyline engine bay that well but i will try and find these and see if its all connected

Couple suggestions if all above fails, as i had the same problem with my gtt.

1. Check the solder on the boost sensor (find in the r34 service manual). These solders can become dry and stop working.

2. Try and borrow someones triple cluster to test to see if its your gauge or not (in my case it was my gauge).

3. Buy after market gauges.

Hope this helps.

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