Suit ZD30, RD28, TD42T & TB45
This 15Psi Switch is a standard replacement for the TB45
The ZD30 has a 15psi switch and a 25psi switch. and it is common for them to give trouble.
The 15Psi switch can be fitted in place of the 25Psi Switch also.
This Switch is located on the passenger side of the engine.