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I have a couple of things for sale after switching ECUs 

First -  HKS AFK AFR Gauge and Knock Monitor.

In Good working condition, comes with all wiring, sensors

Fully configurable with warnings etc. 0-5V outputs for integration with various ECUs.

Even supports dual lambda sensors and headphone output.
High precision measurement of air/fuel ratio is possible with Bosch A/F sensor included in this product.
Monitor knock through headphones to aid setup of fuelling/ignition with F-CON V Pro or a similar device.
Knock level threshold can be set and shown in the display by setting knocking conditions.
The air-fuel ratio and knock level can be output as voltage signals. Connecting the A/F Knock Amp to an F-CON unit allows controlling the air-fuel ratio feedback, knock retard, etc.
Two A/F sensors can be used together. (Bosch A/F sensor is included.) 1 main unit can measure 2 different A/F values of the V-bank engine or multi-cylinder engine using 2 sensors.

HKS Part Number 44006-AK003

£250 + Postage 

Second - 

Original Greddy Profec B boost controller 

Very simple to use, I have used it for a number of years with no issues, as you can see it has some superficial damage on the solenoid unit, this was on it when I bought it and does not affect its operation. 

£50+ Postage 

Manual - https://cdn.shopify.com/s/files/1/0773/3421/7015/files/PRofec_Bspec.pdf?v=1710974290