The ECU are interchangeable with the start box with some problems. If you are
using the newer Air or electric start ECU the older start box will not display you glow plug
adjustment and CP setting that you power adjustment.

The older ECU and start box only set your throttle adjustment and pump prime.

RED -BATTERY

BLUE- GLOW PLUG

YELLOW- PUMP

To let you in on a simple mod to turn your 750f 17 pounder to a 21/23 pounder
only change the older fuel pump the the latest fuel pump (simjet/ jetcat/ FTE)
all can work

good luck

Unknown