If the lights come and go, I doubt it is a fuse. I would guess that you have a bad solder joint, somewhere in your dimmer circuit (Mazda used a PWM dimmer rather than a resistor-type dimmer like everyone else of the era used, so it is a rather complex dimmer circuit).
I didn't know the RHD switches were different (not that I have much experience with RHD RX7s).
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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