B19/B21/B23/B230 TUNE
Two different curves in the distributor simultaneously, switching between them from the cab with a switch.
Can be changed live!
Boost retard, meter on the computer screen, etc..
New coil is recommended because old coils are often too low resistance, is not stable in operation.
(Do not go below 1ohm operating)
Note! Drive from old distributor must be used on the new 123 unit