Here's my problem. Installed a set of speco gauges on my ca18det. I am using the stock ca18 water temp sender for the dash to run my gauge. It's mot even close to to accurate. I couldn't use the one speco supplied as it was the wrong thread. Please help... Also ca18 oil sender same problem couldn't fit the speco supplied sender cause its to big... Reads max scale when engine off... I assume the stock one is a switch not a transmitter...