I will add my words a low pressure sw for the oil and a low temp sw for the water can be added at the OEM location for each type of reading in the block.
Run a 12v feed line from the battery to the pressure/Temp Sw痴 and to high output LEDs as stated.
Mount the LED in a small panel and put them in the BH Control Panel or mounted to it.
Yes they will light up when the key is turned on as stated and will go off as soon as the low pressure/temp sw痴 value are reached.
Only special things needed would be the High output warning light(s) and the sw痴. wiring can be small ga (18-20) automotive wire (not the Home Depot kind - get it from a marine based electrical supply or something like that).
A warning buzzer is nice if the engine isn稚 running at high rpms but if it is then you may not here the buzzer and the LED Lamps are not as annoying as the buzzer.
Great idea, I will add to my To-Do List.
Just my 2 cents and thanks for listening.