some advice tips help please

WB tonner

just dropped a 253 and trimatic in - was 6cyl manual. I have used a complete wb column trimatic wiring harness for conversion too.

blinkers and horn were working until I put GTS wheel on and/or new neutral safety switch. Tried a regular steering wheel again - no change. changed direction indicator switch/horn contact switch as horn contact was worn - no change. When I press horn pad I can hear the relay clicking but no horn noise.

heater fan and temp gauge are not working. Fan did not work pre conversion. I've tried other senders and gauge. I've also tried two other fan switches. Temp wire from harness jumps around all over the place from 1.3V to 9.5V with ignition on (don't know if this is abnormal).

have checked all fuses visually and all (except brake lights - bottom left two) seem to have 12V with ignition on.

i have a multi-mete but that's about were my tooling and skills end!

any suggestions would be appreciated