[LMH]

The problem I've run into on a couple cars is the use of higher pressure switches that need 60-120 pounds of pressure. Cobras are light cars and don't usually require that much pressure. There are low pressure switches made that engage at around 20-25 psi and work much better in cars like this. Ron Francis sells one but there are other places that sell them as well. Just check the pressure range of the switch before buying.
Larry