nismosilvia270r

iTrader: (5)

I followed the DIY on this forum to a T. It's been plagued with problems ever since. Cluster looked clean before install.

1st problem: Tach is intermittently erratic amd sometimes won't swing above 2500 rpm even though the engine revs higher. This problem seems to have gone away when the other problems started.

2nd problem [resolved]: After installing an oil pan brace and plugging in the oil level sensor (previously disconnected) the engine would die intermittently. Discovered that the USDM oil level sensor pin on the JDM cluster interferes with the boost gauge by grounding the MAP sensor and TPS power. Simply disconnecting the oil level sensor fixed those issues.

3rd problem [currently ongoing]: When the key is ON, engine OFF, the tach swings to 1000 rpm. With the engine ON, the tach is 1000 rpm higher than the actual rpm on PowerFC. This problem is intermittent, as in, the tach doesnt always preload to 1000 rpm before starting the engine. 50/50 when it's accurate or not. Also, Tach occasionally fluctuates.

Some actions taken:
- radio on, radio off. No effect.
- blower fan on/off. No effect.
- moved ground from left dash bar to steering column. No effect.

Just posting to see if anyone had issues with their 99 cluster. Especially the oil level sensor interference. I cant be the only one, but I haven't seen any information about it.

DaleClark

iTrader: (55)

Did you add the additional ground? I know you have to do an extra one with the 99 cluster.

Also possible you just have a bad cluster - it's possible it's not perfect.

Dale

$lacker

iTrader: (9)

I think I had that tach issue when I was sharing a ground between 2 components. Maybe PFC and wideband? Something like that

Gen2n3

iTrader: (1)

Nismo,

What DIY instructions did you follow? Do you still have the original cluster? Was the original a USDM cluster? I lack the exposure to the JDM cluster however, I tinker with the speedo board. As a reminder, the Speedo board controls the tach.

Dale suggested that you verify/add an additional ground wire to the cluster. The location of ground between the chassis and cluster may have some impact - the location on the chassis may be good, but what about the ground point on the JDM cluster? That may solve the bouncing tach. You may also want to inspect the speedo board for any potential problems. There are a few threads to cover its repair.

Two final questions: Does your odometer display mileage when the Ignition is set to ON and engine is OFF? Does it stay on or blank out when your tach fluctuates or pre-loads to 1,000RPM?

Cheers,
George

nismosilvia270r

iTrader: (5)

Thanks all.
I used the "RX7 Boutique" instructions. I added the ground from the appropriate screw to the dash bar and then steering column. I also added the signat wire from the oem map sensor to another screw on the cluster.
The odometer/tripmeter displays kilometer information at all times.
The cluster had the bouncing tach before and after i calibrated the speedo with the adjustable resistor, but I wont rule that out as leading to other speedo board problems.
i'll pull the cluster this weekend (install newer hood/bezel) and inspect the connections, PCB, and caps.
Thanks!

Gen2n3

iTrader: (1)

Nismo,

DaleClark has a thread that converts a JDM's (speedo board) odo from metric to imperial measurements. It consists of moving 1 or 2 SMD-type resistors into different positions. The odo would then automatically display the correct mileage (ie if the odo displayed 100,000km it would then display 62,137mi).

Please post your results after you remove the cluster and inspect the speedo board. Please inspect the small board on the tach as well.

Cheers,
George