1 - either use stFlow shader (
https://www.racedepartment.com/downloads/stflow-shader.23999/)
no need to install, included in CSP, just use this in ext_config.ini:
[SHADER_REPLACEMENT_...]
MATERIALS=your_material
SHADER=stPerPixelNM_UVflow
FILL_MISSING_TEXTURES=1
PROP_0 = offsetDSpeed, 0.01, 0.0 ;;; adjust for moving direction
2 - or like this, with an extra color lut file, from SRP - shuto revival project:
[CONDITION_...]
NAME=SRP_RAINBOW
INPUT=ONE
FLASHING_FREQUENCY=0.1
FLASHING_SKIP_OFF_STATE=1
FLASHING_NOISE_AMPLITUDE=0
FLASHING_MIN_VALUE=0.0
FLASHING_SYNCED=1
FLASHING_SKIP_DOWNHILL_STATE=0
FLASHING_SMOOTHNESS=LINEAR
FLASHING_LUT=srp_rainbow.ini
[MATERIAL_ADJUSTMENT_...]
MATERIALS=your_material
KEY_0=ksEmissive
VALUE_0=150, 150, 150, 0.5
VALUE_0_OFF=0, 0, 0
CONDITION=SRP_RAINBOW