Got it about a year ago and jumpered it in real quick just to make sure it indicated and it did. Wired it in while the car was down waiting for new exhaust stuff (the CEL was on cuz the manifold was cracked). The drive into town it worked but took a dump on the way outta town. Sent it in and they repaired it & sent it back in about six weeks, no charge. It's worked since then but after 3 months a segment of the lower display went out and about another segment per month has quit since then so you can't really tell what it reads. 50$ or so from summit incl shipping down the toilet.
And the tach only reads in whole hundreds - so why bother with digital. POS