I purchased a SunPro 0-100psi mechanical oil pressure gauge from them that when it was installed it it would not return to zero. When I contacted them I was told that because I used a Bosch copper line tube kit instead of the nylon tube, which will not stand up to the heat and vibration in the engine compartment for extended periods, that they sent with the gauge that I had voided the warranty but they did not warranty any way. Bosch is the parent company of SunPro . This company, I believe, intentionally and knowingly sold me a defective product. rods and custom parts Gulf Breeze, Florida. They sell on ebay.