Read & Download schematic below, it covers the connection between the RM-Primis ECU and the GEN1 8HP Transmission TCU along with the BMW F-series Shifter, 10 and 8 Pin versions.
All our RM-Primis ECU's are compatible with 8hp transmissions, please visit our website to find out more about our ECU's and 8hp acessories - https://rmracingelectronics.com/product-category/8hp-controller-wiring
Right click to download: 8hp_schematicc.pdf