Let's talk instrument cluster voltage limiters!

FWIW, I have had a 7805 based IVR in my 68 Barracuda since late 2000 and in that time I have driven almost 60,000 miles. The 7805 has perfromed flawlessly.

IMHO, if you don't want to build one yourself the DemonIVR unit at $35 is a very fair price considering that there is going to be about an hour of labor putting it together and testing it. With the RTE unit you need to temper the advertised advantages with the knowledge that they want to sell them so the advantages are going to be overstated, then make the decision if it's worth the price.